When searching the Library's Catalog, try different search terms when looking for information.
Start with your topic. Type it into the search box to see what you get. For example, [Saint Bernadette of Lourdes]
If you don't see what you need, try a different search term. Generally, it's a good idea to go broader. So the above search term might be changed to [Saint Bernadette]
Again, if this doesn't work, Google the topic, and see what you find. For Saint Bernadette, we discover she is an incorruptible. Try that as a search term. [incorruptible]
Research is often a process of trial and error. If at first your search does not succeed, try and try again.