Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
trong tan » trong quan, trong cac, trong ca
tong quan » thong quan, tong luan, luong quan
cua dung » cua dang, cua dong, qua dung
tran ban » tranh ban, toan ban, tran bai
tran van » luan van

You may be able to get more results by adjusting your search query.

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