Thank you for your response. I appreciate it. Thank you!"tree tech" keyword has 1500 monthly searches on Google (at USA + UK) having $4 CPC and low competition.
Domain Age: 3 years, 1 months, 12 days
Also most of the other good TLDs are registered at good prices.
Meanwhile there is a "treetech inc" named USA based company and also some similars at Europe. It means there may be some Trade Mark issues as i understand.
They are what i found. Hopefully they can guide you some...