Generally, a Quick search of specific words, phrases, or *word* to match anywhere within a word should find what you need. For Advanced search, the Matches wildcard operator is the equivalent of a quick search.
Since v4, UR uses SQLite's full-text search feature by default (rather than auto-generated keywords), so 'Contains keywords' is only meaningful for manually assigned user-defined keywords.
More details here:
http://kinook.com/UltraRecall/Manual...noperators.htm
http://kinook.com/UltraRecall/Manual/phrasesearch.htm
http://kinook.com/UltraRecall/Manual...d_keywords.htm