i need to find a song but only have a few lyrics
You can search the Internet using the lyrics that you do have. If you have a complete line or verse you can put the line into quotes (" ") for a more specific search.
To find a song by knowing only a few lyrics, you can search them directly in a search engine. You can also try some websites that specialize in lyric searches. For more information, see this link: http://www.lyrster.com/.