Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh qua » tranh cua, thanh qua, trinh qua
dung cong » dung trong
qua dung » quang dung, su dung, qua song
cong san » cong tac
tban cau » toan cau, toan cao, ban can
ban cau » bang cau, ban can, van 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 qua dung cong san ((tban cau) or (ban cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh tranh qua dung cong san ((tban cau) OR (ban cau)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh qua dung cong san ((tban cau) or (ban cau))*.