How can search in whole foums/ Not getting actual result

You can add filters to limit application type or to a specific section  via the following:

$query.Add('Filters', "type::forum && (section::24 || section::1)" )

its not working

for this i am getting 0 record

#set ($searchQuery = "%{}")
#set($query = "(type::blog && section::1546)" )
$searchQuery.Add("Filters", $query)
$searchQuery.Add("PageSize", 15)

#set($results = $core_v2_searchResult.List($searchQuery))
count $results.TotalCount

but for below code i am getting 6 record

#set ($searchQuery = "%{}")
#set($query = "(type:blog && section:1546)" )
$searchQuery.Add("Query", $query)
$searchQuery.Add("PageSize", 15)

#set($results = $core_v2_searchResult.List($searchQuery))
count $results.TotalCount

its not working

for this i am getting 0 record

#set ($searchQuery = "%{}")
#set($query = "(type::blog && section::1546)" )
$searchQuery.Add("Filters", $query)
$searchQuery.Add("PageSize", 15)

#set($results = $core_v2_searchResult.List($searchQuery))
count $results.TotalCount

but for below code i am getting 6 record

#set ($searchQuery = "%{}")
#set($query = "(type:blog && section:1546)" )
$searchQuery.Add("Query", $query)
$searchQuery.Add("PageSize", 15)

#set($results = $core_v2_searchResult.List($searchQuery))
count $results.TotalCount

I'm not 100% certain, but do you have to pass in some sort of search query for the top one instead of simply just setting the filters?

Not working

Post your code again...did you actually add something in for the query?

Have you made changes to your code based on Luke's recommendation, if so, can you share your updated code?

It's because filters use the [confusing OR-like] format of '||' for field separators. Try:

#set ($searchQuery = "%{}")
#set($query = "(type::(blog OR forum)||section::1456)")
$searchQuery.Add("Filters", $query)
$searchQuery.Add("PageSize", 15)

#set($results = $core_v2_searchResult.List($searchQuery))

so its: fieldname::value||fieldname2::value

Additionally, the value in the .Filters string are not parsed directly by search which may be evident via the "::" separators. Instead the values are parsed into field filters before being added to the query.

#set ($searchQuery = "%{}")
#set($query = "(type::blog && (section::1546))" )
$searchQuery.Add("Filters", $query)
$searchQuery.Add("PageSize", 15)
$searchQuery.Add("Sort","date")

#set($results = $core_v2_searchResult.List($searchQuery))
count $results.TotalCount

#set ($searchQuery = "%{}")
#set($query = "(type::blog && (section::1546))" )
$searchQuery.Add("Filters", $query)
$searchQuery.Add("PageSize", 15)
$searchQuery.Add("Sort","date")

#set($results = $core_v2_searchResult.List($searchQuery))
count $results.TotalCount

code give unexpected result

#set ($searchQuery = "%{}")
#set($query = "(type::blog AND (section::1546))" )
$searchQuery.Add("Filters", $query)
$searchQuery.Add("PageSize", 15)

#set($results = $core_v2_searchResult.List($searchQuery))
count $results.TotalCount

count is 2721138

You cannot use query syntax (AND, &&, etc) to join multiple filters when using the .Filters property. Is must in the format mentioned where || is the separator:

field1::value1||field2::value2||field3::value3

Filters in this property are always a MUST (required) so effectively AND(ed) together; i.e. all conditions must match. You can apply SHOULDs/OR to the field values with a single filter (ex. type::(blog forum))

So for your scenario you need to use the format in my previous reply which in this case would be "type::blog||section::1546"

As for your last example, my guess is that it didnt apply any filter.