Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
cua dung » cua dang, cua dong, qua dung
cong ban » cong bang, cong dan, dong ban
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
tran cau » tran chau, toan cau, ran cau

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 - canh tranh cua dung ((((cong ban) OR (cong san))) or (cong tan)) tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh tranh cua dung ((((cong ban) OR (cong san))) OR (cong tan)) tran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - canh tranh cua dung ((((cong ban) OR (cong san))) or (cong tan)) tran cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh cua dung ((((cong ban) OR (cong san))) or (cong tan)) tran cau*.