8 STEPS
1. Search for your desired topic or site, then click Settings.
2. Click Advanced search
3. You will now see all advanced search options. Click this exact word or phrase to search for the exact string of words you've typed in.
4. Click none of these words to exclude results that contain specific words. You can also do advanced searches directly in the G-Search bar using the directions at right (ie - include a minus sign in front of words you want to exclude in your search).
5. Scroll down to the "file type" setting to narrow your search results by filed type and click any format
6. From the drop down, select the specific file type you are looking for (in this case PDF (.pdf))
7. Click Advanced Search to then conduct your search.
8. Our search has now changed to find only .pdf file type results.That's it, you're done.