Perhaps you should try some spelling variations:
thanh tung » thanh cong
cong thanh » dong thanh, cong trinh, cong tan
hien xanh » hien hanh, hien nhanh, chieu xanh
cua thong » cua thuong, cua khong, cua tong
tung cua » trung cua, tuong cua, dung cua
cong dan » cong san, cong tan, huong dan
than cap » khan cap, thanh lap, thanh cac
khan ap » khan cap, han ap, khan dam

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 - thanh tung cua thong ((cong dan) or (cong thanh)) ((than cap) or (khan ap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - thanh tung cua thong ((cong dan) OR (cong thanh)) ((than cap) OR (khan ap)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - thanh tung cua thong ((cong dan) or (cong thanh)) ((than cap) or (khan ap))*.