When you type keywords in the search, Google will bold the requested keywords as well as their synonyms.For example if you type Japanese cars, the synonyms like vehicles will be bold as well. But not all of them are bold, sometimes even car is not bold either. Is there a certain rule when Google decide when to bold certain keywords and their synonyms? Is there a way to find out what synonyms use for each keyword?
How does Google decide when to bold synonyms for query keywords?
google search;keywords