Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
thanh tang » thanh trang, thanh tung, thanh hang
hang cong » dang cong, hang nong, bang cong
ban thanh » ban hanh, ban hang
thanh tap » thanh lap, thanh tai, thanh tay
van hang » van khang, van hoang, van thang
cong ban » cong bang, cong san, cong tan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hien) or (theo tieu)) xanh - ((thanh tang) OR (thanh thang)) van hang cong ban thanh tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (theo tieu)) xanh - ((thanh tang) OR (thanh thang)) van hang cong ban thanh tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (theo tieu)) xanh - ((thanh tang) OR (thanh thang)) van hang cong ban thanh tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (theo tieu)) xanh - ((thanh tang) OR (thanh thang)) van hang cong ban thanh tap*.