Yes, a semicolon (;) will OR the search terms (find 'this' OR 'that' OR 'those'). To AND the search terms (find 'this' AND 'that' AND 'those'), use a space character ( ). Unfortunately, 1 of the major drawbacks of the Windows Search Companion tool is that there is no way to do a NOT search (find terms containing 'this' but which do NOT contain 'that'). I find a need to do such a search sometimes but have to settle instead for a larger than desired result set.
PS. I believe a NOT search is supported by the Indexing Service Query Form (ciadv.msc) but this method is not nearly as user-friendly or convenient.
PS. I believe a NOT search is supported by the Indexing Service Query Form (ciadv.msc) but this method is not nearly as user-friendly or convenient.