Learn How to erase searches on google
You are able to delete your Google search history anytime. Still prior to doing therefore keep in mind that saving your history will help you identify information you’ve looked for during the past or pages a person visited previously. Like in case you visited a website having a great pasta formula but can’t keep in mind the particular site was known as, you are able to look over your history to discover it.
Here is the answer from google itself
Delete items from your Web History
Visit your Web History page at https://www.google.com/history or click the gear icon gear icon on the upper right corner of a search results page, and go to Web History.
Select any items you don’t want and click the Remove items button.