Install a new browser, pick one, and only use that for searches with all other browsers closed. When done clear the cookies. That way your search info is sandboxed. Your ISP and the search engine will still track your history but the search engine cookies will be gone, and the engine won’t see the other cookies from the web surfing you do using other browsers.
1. Use a VPN
2. Avoid chrome, it is google spyware
3. Use icecat (Firefox without Mozilla trackers)
4. If you can’t use icecat, use Firefox
5. On Icecat or Firefox install add-ons google containers and Firefox containers to sandbox google and facebook
6. Install Firefox add-on Unlock Origin
7. Install Firefox add-on Canvas Blocker
This is about as secure as you can get without extreme measures to prevent tracking and fingerprinting. Use anything other than google for search.