Leave fields blank where you don't wish to filter by that field.

Find all links where
the title contains is exactly is not has any of the words has all of the words boolean
and the description contains is exactly is not has any of the words has all of the words boolean
and the URL contains is exactly is not has any of the values has all of the values boolean

or

Find all categories where
the name contains is exactly is not has any of the words has all of the values boolean
and the description contains is exactly is not has any of the words has all of the words boolean
and the number of links contains is exactly is not is greater than is less than has any of the values has all of the values is between boolean
and the number of subcategories contains is exactly is not is greater than is less than has any of the values has all of the values is between boolean
and a parent name contains has any of the words has all of the words boolean

or

Find all members where
the member's name contains is exactly is not has any of the words has all of the words boolean
and the number of links submitted contains is exactly is not is greater than is less than has any of the values has all of the values is between boolean
the member's email contains is exactly is not has any of the words has all of the words boolean

Note: Boolean searches allow you to use "and" and "or" as operators, and to group them with parenthases. A boolean search "books or videos" would return all results which contain either the word "books" or the word "videos". You can also use parenthases to group combinations. A boolean search for "(books or videos) and cheap" would find all results which contain either "books" or "videos", only so long as they also contain "cheap".