In day to day speach there a few words we use quite frequently such as "the", "a", and "to". Most search engines will ignore these words when they are included in a search. If these words are vital to your search you can include them as part of a phrase using quotation marks. For instance, if you are looking for information about a book called "The Stranger" you might want to enclose the words in quotaion marks. Otherwise, the search engine may ignore the first word and the results that you get may not be relevant.