(I'm going to assume that your post is not sarcastic or meant as an insult.)
I haven't searched for ANY minecraft related stuff for months, then i played ftb for like 15 minutes. Day later i find on my youtube recommended ''minecraft mods ftb infinity...''.
Who knows, it might be Curse (the people hosting the FTB modpack files). Or even Mojang. Their privacy policy states that they do not share data with unrelated third parties, but nobody can say what exactly that means. (Especially since Microsoft bought Mojang.)
Maybe voice recognition from any smart phone, maybe that new shiny xbox with a camera. Can be everything.
Those would be too inefficient to analyze in mass amounts, and the amount of useful data from those sources would not be worth the effort. In certain cases it's not very hard to find out how devices are related to each other though. Say you have your smartphone with you, and you use a Google account. (This is almost certainly true if your phone runs Android.) Google will be able to identify your smartphone now. If your smartphone has access to your home wi-fi, Google can link your home router's IP address to your smartphone. If your smartphone has access to your sister's wi-fi, then that can be linked as well. Because all devices behind the same router use a single IP address, Google can assume that any data from that IP could be related to you. So if you google something using any device in that network, that data can be indirectly linked to your home network. Even if this is not your exact situation, there are many such ways to relate data from two different sources.
Oh yeah, ''google it''. Another term what a single company took over.
Then use a different search engine. Such as DuckDuckGo. Whether you trust them saying that they don't track you is your decision, but even if they were to collect data and send it to Google, it couldn't get any worse than it already is.