@Rubén The tag-wiki contains the sentence: If you are talking about search, use the google-search tag instead.

Perhaps it could help adding the same sentence to the tag-excerpt. (It would be more prominently visible - the tag-excerpt is displayed whenever somebody adds the tag to a question.)

@MartinSleziak The tag wiki for google was updated few minutes ago. Hopefully this will help to reduce the use of it when should be used google-search.