The "Artist Name & Song Title" is the most common and quickest way to find the lyrics for the song you are looking for. Also, the search type option "Artist Name & Album Title" is meant for those who are looking for lyrics to an entire album.

In the event that you only know a catch phrase within a song, use the "Song Title & Lyrics Text" search type option. Note that this search type returns MANY results in most cases.

Enter partial keywords (eg. "pac" would return results including "2pac", "tupac" and "pacific")
This applies for all keywords entered, artist or song title.