Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien xanh » hien hanh, hien nhanh, chieu xanh
trung hoc » trung quoc
thanh cac » hanh cac, thanh bac, thanh ca
dan cong » dang cong, van cong, dan dong
cong tac » cong ty
than cap » khan cap, thanh lap, than cua
phan dau » phan tu, hang dau

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