Your goal is to find a government document. This page will show you the difference.
The whole search doesn't show in the text box, but the full search string is:
tasers (document or report) “U.S. Department” site:.gov filetype:pdf after:2015
|tasers||tells Google to search for the word "tasers"|
|(document OR report)||tells Google to search for the words "document" OR "report" -- you need the parentheses and the Boolean operator "OR"|
|"U.S. Department"||the quotation marks tell Google only to find instances of these characters appearing together.|
|site:.gov||tells Google to only search sites in the .GOV domain|
||tells Google to only search for PDF files [Documents are most likely to be posted to the web as PDFs.]|
|after:2015||tells Google to only return pages posted to the web after 2015|
“less than lethal” (document or report) “U.S. Department” site:.gov filetype:pdf after:2015
Same search using "less than lethal" as the first item in the search string. Note: the quotation marks are required.
“Body armor” (document or report) “U.S. Department” site:.gov filetype:pdf after:2015
Similar search using "body armor"