Before you start searching, it is very important to consider the key topics and establish appropriate terms. Rather than entering a whole assignment title, you need to pick out the important words needed to describe your topic.
The databases will only look for exactly what you type in though, so for each keyword you need to apply a few search tips.
In addition to considering what other terms may have been used to describe that topic, you should also think about broader and narrower terms, different spellings/word endings etc.
From the following assignment title the key concepts are highlighted:
"Discuss the impact of social media on teenagers"
So the terms you will be using in your search strategy are social media and teenagers.
Some tips when selecting your search terms:
e.g. teenager, teen, teens, youth, young adult, juvenile, adolescent
e.g. colour / color, behaviour / behavior, lift / elevator
e.g. heart attack / myocardial infarction
e.g. child, child's, children, childhood
e.g. computer aided design / CAD