Best way to search in Google or any other search engine

 Well, there is always a time when we search for something and we dont get it right away on the Google search results. 

Supposed you are looking for a movie download consider it as The avengers! 

You would search for the key word 'Download avengers' this will give you some couple of useless sites which never has option for direct downloads. 

For better search results user key word like 'download+avengers+mkv+mp4' this would give you a better results then just  naming a  movie