1. You can select Entire Site or Titles Only. Searching Entire site includes Short Cuts. By default, entering multiple words will search for sections where all words appear within 50 words of each other. Use quotation marks around a phrase to return results with exactly that phrase.
2. In the drop down list that appears when writing a word in the search form you get three options: select All results to get all records that contains the search terms. Or select a Book title. Or select a Suggested term.