Android Library bug

I've never had great success getting the library to work properly. I don't want to look up the various forum discussions about this, but essentially, I would like to look up, say, "Greek" and find everything in my library with "Greek" in the title or description or whatever, similar to the behavior I get on the desktop app.

(As a significant side note, if I type "Greek" (with or without quotes) and "New" (with or without quotes), I get everything with Greek and new in the title. But if I type "Greek" and "Danker", since these terms are used in different fields, I don't get anything. But if I type Danker and Walter, I do get BDAG. So it seems that using multiple terms rivets the search to use one particular field.)

If I use the filter button to select, say, Downloaded resources, and then type "Greek" (with or without quotes) in the text field, I'll get correct results. Likewise, with no filter set, if I type Greek (without quotes) in the text field and then use the filter to select Downloaded resources, it works the same way. However -- and here's the bug -- if I type "Greek" and then click the filter button, the message "Error" appears on the bottom and the app hangs.