Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
khung cong » nhung cong, khung long, phung cong
hien xanh » hien hanh, hien nhanh, chieu xanh
trung dai » truong dao, trung tam, trung cap
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cap » khan cap, thanh lap, thanh cac

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 xanh) or (tien thanh)) - thanh ((trung dai) OR (truong dai)) khung cong tan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (tien thanh)) - thanh ((trung dai) OR (truong dai)) khung cong tan than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (tien thanh)) - thanh ((trung dai) OR (truong dai)) khung cong tan than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (tien thanh)) - thanh ((trung dai) OR (truong dai)) khung cong tan than cap*.