You should use both closed and open questions. The benefits of open questions you learn more and get more information on the thing you are asking about. The benefits of using closed questions you get straight to the point and get a quick answer.
You should use Google search tips for getting the answer to a question quicker and getting a more likely answer. One example is using the minus sign if you don't want a certain thing to show up in your search. Another example could be using quotation marks to find a certain phrase.
