将字符串解析为部分，仅解析连续的单词，而不是幂集

I'm trying to write a search query to find articles from a database. I would like to take the search string the user enters and look for a specific set of possible search terms. If the user entered the search string "listing of average salaries in germany for 2011" I would like to generate a list of terms to hunt for. I figured I would look for the whole string and for partial strings of consecutive words. That is I want to search for "listing of average salaries" and "germany for 2011" but not "listing germany 2011".I'm trying to write a search query to find arti