You can use either AND, OR, NOT operators or &&, ||, ! operators.
With + and you can make a word required or exclude a word from the search.
Search fields are: message, subject, name, email. You can specify in which field you can search.
Example searches:
providex and subject:writer providex is required and writer is required in subject
providex and subject:writer
+providex -subject:writer providex is required, but exclude documents where subject contains writer
+providex -subject:writer
subject:(+pdf +"providex writer") Subject needs to contain pdf and the phrase providex writer
subject:(+pdf +"providex writer")
+(pdf OR writer) +providex Message needs to contain pdf or writer and providex
+(pdf OR writer) +providex
+"providex writer" "providex pdf" Message needs to contain providex writer and may contain providex pdf
+"providex writer" "providex pdf"
"providex writer"~10 Proximity search: the words providex and writer have to be within 10 words of each other
"providex writer"~10
roam~ Fuzzy search: will match words that are spelled like your word (foam, roams).
roam~
"providex writer" "pvx writer"^4 Boost search terms: The search term pvx writer is made 4 times more valuable for your query than providex writer.
"providex writer" "pvx writer"^4