By excluding "Bluetooth" from the search results and choosing "filetype PDF" in the advanced search menu my students were able to get past a lot of their initial frustration.
In this short video I demonstrate how to exclude words from search results and how to search by file type.
Another little tip to pass along to your students when they are searching for PDFs is to remind them to use "Ctrl + F" (Windows computers) or "Command + F" (Mac computers) to search within a PDF for keywords or phrases.
I include more tips like these in my on-demand webinar, Ten Search Strategies Students Need to Know.