Is it possible to add a feature where one can search for specific phrases, word to word like it is possible on popular search engines?
Yes! This already planned. You will be able to make more complex searches:
E.g:
"Not your keys not your coins" AND ((bot) OR (hack))
For posts that hace this exact phrase and the word bot or hack. Right now, your phrase would return all posts that have the words "not", "your", "keys" and "coins" anywhere, so not that precise.