How to effectively search?

Phrase search (””)
Double quotes around a set of words can be used to tell Search to find the exact words in that exact order without any change. For example, search

“Cars Insurance USA”

will find only pages where this exact phrase is posted.

Terms you want to exclude (-)
Attaching a minus sign immediately before a word states that you want to filter out pages that contain this word. The minus sign should appear immediately before the word and should be preceded with a space. For example, query

Mobile Phone -iPhone

will exclude all posts with "iPhone" word from the search results.

The OR operator
By default all words in a search query are considered by search engine for finding mentions. If you want to specifically allow either one of several words, you can use the OR operator (note that you have to type ‘OR’ in ALL CAPS). For example, query

iPhone OR “Google Pixel”

will give you results about either one of these words.