Always start out with simple one word searches, you can always narrow it down more later by adding additional words. For instance,
if you're looking for "Martin Luther small pocket catechism book in German from 1909", never type that whole thing into the search page.
In this example, you might want to try the search word, "catechism" or maybe search for "luther" AND "book".
Here's a video on YouTube showing this example and the results you'd find, but you're welcome to try the search yourself too!
