PDFSearcher -Internal research 4+

A few suggestions

I keep my food recipes in PDF files on my Mac organized in folders and subfolders, and often need to find recipes containing specific ingredients. Overall this app does what it promises, however, just meeting the bare requirements only warrants 3 stars. A few suggestions: 
(1) Allow searching by multiple keywords. I can search for "chicken", but it would be nice to be able to search for files containing both "chicken" and "basil", for example.

(2) The matching file names are sometimes truncated if they're long, not sure why since there's plenty of space available to display.

(3). When you open up a matching file, the results are displayed in a small window that I need to enlarge. Each time I open a file a separate window opens up. How about having a single window that allows the user to move to the next matching file, rather than opening up a new window each time? 

(4) Allow automatically searching subfolders. I rarely go more than one level deep, so this is important.

Items (1) and (3) are the most important of these to me. Thanks.