Double-quoting a phrase usually finds what you want. For example, at this site ubook4u I type “paradise father’s love” and get this result (see pic). If this does not work for you, make sure you use straight quotes ( “…” ) not curly ones
The search engine on this website is also very good. Go to the main menu and click on The Urantia Book/Explore The Urantia Book/Search.
I just did a search on “faith”. Once you get the lists of paragraphs, you click on the paper reference and it will take you to the part of the book where that paragraph appears. See the screen shots below on the process involved. Cheers.