There is a set of words, referred to as stop words, that the application will ignore (see http://en.wikipedia.org/wiki/Stop_words).
The stop words used in this application are too many to list here. They include articles (‘a’, ‘an’, ‘the’), conjuncts (‘and’, ‘but’, ‘either’, ‘for’, ‘how’, ‘if’, ‘unless’, …), prepositions (‘in’, ‘on’, ‘over’, ‘under’, ‘besides’, …), and pronouns (‘he’, ‘she’, ‘him’, ‘her’, ‘they’, ‘this’, ‘that’, ‘we’, ‘you’, …), among others.
All remaining words, after removing stop words, will be searched.