Users are not able to find the solutions unless they type in a full keyword. For example "w9" gets no results but "W9 form" does. I have added so many tags for every combination. 

Is there a minimum number of characters a customer must enter in search before receiving results?

Everyone is used to google and other search engines that adjust results based on each keystroke. This would be a very great feature to add as is currently prohibits and frustrates customers.