Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
anh tang » anh bang, anh dang, anh nang
cua dang » cua cong, cua ban
cua dong » chua dong, cua cong, cua nong
cong van » cong vang, song van, cong tan
cong san » cong tac
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 - anh tang ((cua dang) or (cua dong)) ((cong van) OR (cong san)) than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - anh tang ((cua dang) OR (cua dong)) ((cong van) OR (cong san)) than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - anh tang ((cua dang) or (cua dong)) ((cong van) OR (cong san)) than cap".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - anh tang ((cua dang) or (cua dong)) ((cong van) OR (cong san)) than cap*.