Searching will be easier if you think about your search terms before you begin, so make a list of keywords, concepts, or subjects that you want to search for. Try searching for 'dogs' by clicking on Keyword. Try a second search for 'dogs' by clicking on Subject in Destiny Classic. You probably noticed that there were lots of resources when you searched by subject and even more when you searched by keyword.
You can also narrow or refine your search by sublocation. This will give you all the books that might be interesting in a particular school division. To clear all limiters in order to start a new search, just click on Reset All.
Look at some of the titles in the list again. Maybe you just want to know more about domestic cats. You may also have noticed the message asking you whether this is what you are looking for. The system is reminding you to think about how to improve your search!