In Google, we tend to search by typing in our questions as sentences, but most library catalogues or article databases do not understand this "natural language" searching. This is why it’s important to break down your question into main ideas.
The main ideas of your question or research topic are what you’ll want to discuss in your assignment. A question usually has more than one main idea (often three or four).
Your question is "What are the effects of media coverage and public opinion polling during an election campaign?"
There are three main ideas in this question:
For a search strategy to be effective, you need to be able to tell the difference between significant and non-significant or meaningless words. Terms like "consequence" or "effect" are non-significant because they don’t represent an idea. They may even reduce the amount or results you get in your search.