Hello

I want to track search terms from google ads.
(e.g. Someone types in “interior design” on google, sees my ad, clicks on it, fills out my “standard embedded typeform (survey) on my website)
I want to know what was the “search term” that triggered the response. Is this possible? And if yes, which “hidden field” should I use and how to set it up correctly? 

p.s. I’ve tried many things so far and usually I dont get the information I want (too broad). 
If anyone has an answer to this, I would be really grateful if you can share it with me.
Thank you!