If you search for serveral things you can choose the kind of link here. The key word ODER stands for finding one of the words you search for, the key word UND stands for finding all words in one document.

or
and

You can put in the extend for the search. You can choose from the whole document , the Meta-Tag: DESPRIPTION and the title. The whole document will be searched for.

full text search
only META-TAG
only title