You can make use of the following query syntax when using the free text search filter parameter:
Single terms, phrases, etc can be combined using "AND".
cat AND dog
Single terms, phrases, etc can be combined using "OR". If not otherwise specified, the search fragments will be ORed together by default.
cat OR dog
Single terms, phrases, etc can be combined using "NOT" or prefixed with "!" or "-" .
cat NOT dog
Make a term or phrase mandatory by prefixing it with "+".
Enclose in double quotes to search for a complete phrase.
"internet of things"
Wild cards are supported in both terms, phrases, and exact phrases using "*" to match zero, one or more characters, and "?" to match a single character.
Groupings of terms are made using "(" and ")".
(twitter OR facebook OR insta*) AND app
(twitter facebook insta*) AND app