One of the key things to remember about databases and search engines is that, when you type in your search terms, they will assume you want to look for every word no matter where they appear in the record, or on the web page. So if you want to search more strategically and be the one in control of what is being searched for and how, then you should consider using some of the tools that help you do this.
Some of the advanced tools, such as proximity searching, may not be needed until your final year dissertation, or until you're doing postgraduate research so don't feel you have to use all of them. have a look at the sections below this page in the menu bar, use what's useful and discard the rest.