What query is the best way to search for PDF files including the exact phrase: high school

Is there such a thing as a Google URL shortener?

How can you limit your search to only U.S.-accredited higher educational institutions?

Which of the following would exclude .doc files from this search's results?

What is the symbol to find similar search terms?

What is the name of the filter that blocks/limits objectionable content?

What is the name of the search engine technology due to which a query for the word 'actor' will also show search results for related words such as actress, acting or act?

Which of the following methods can help you get around the Google Sandbox?

What is the difference between strict and moderate filtering?

Google search does not index some common words (such as "or", "and", "when", and "in") within the webpage. What are these common words called?

Which of the following correct searches is the simplest way to find both 2004 and 2005 results?