searching refman using (AND)

Using (AND) in Reference Manager has not produced the desired results.  For example, searching for “Geological Society of America” in one field and using AND “Memoirs” in an other field produces results with Geological Society of America, but no Memoirs.  I do click on the Results button on the far right after the field with “memoirs” in it.  And there are actually a bunch of records with these words in those fields, with the exact spelling. 

Has anyone else run across this same problem?  Or is it that I am not understanding something about the RM search features?