If you're lucky, just entering the word construction will give you your answer. But you're seldom that fortunate. You might try road construction if that's what you're after, but that too might return some irrelevancies. To avoid getting buried in irrelevant responses, you need to define your search a little more clearly. And the technique that most database search engines use comes from the symbolic logic system developed by a 19th-century mathematician named George Boole.
Boolean searches use a basic syntax made up of operators and search terms.
But they don't work quite like English grammar, so you have to make sure you get them straight. Use it when you have dissimilar terms and want to narrow the results to a few precise hits. This is the default operator for most Web searchers. It increases your total number of hits, and though you may get some irrelevancies, it's a good operator to use.