In the advanced search you can search for any word, phrase or none of the words but not searching for posts that contains ALL of the words.
This is highly needed. It's hard to find relevant info on the site now.

Perhaps there is some other way to search for all words but I havent found it. ("+word1 +word2" doesn't work for example).
I rather not use external search engines to find content either.

Nevermind...
It seems like ALL is the default.
I got so much garbage search results that I was sure it searched on any of the words but looking closer at the results they each do indeed contain all the words.