I never cease to be amazed at the great websites for genealogy online! Yesterday I discovered the Digital Quaker Collection at the Earlham School of Religion (a graduate theological school for the Society of Friends). The website states "DQC is a digital library containing full text and page images of over 500 individual Quaker works from the 17th and 18th centuries." Once you enter the site, you can easily search all of the collections, or browse them by title or author. While the default search is a simple search, there are other options for searching which include using Boolean operators, proximity search for finding words near one another, an Index Search, and the ability to search by books of the Bible as they are mentioned in the texts.
The Quakers kept a lot of great records -- let's hope they recorded your ancestors names in these documents too!