We've updated the current version of Voyeur with a maintenance release that includes a fix to a bug that prevented users from doing phrase searches (actually, the search worked the first time, but not subsequent times).
To do a phrase search, simply type in the phrase into the search box (with no quotes). This will search for the exact sequence of types (currently lower case word forms). No proximity search is currently supported (with words in between), though some simple regular expressions can be used: