Perhaps you should try some spelling variations:
vien nganh » vien thanh
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cua » doanh cua, manh cua
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
gian tap » gian tay, gian tam, gian thai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (vien nganh)) - canh tranh cua dung cong dan gian tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (vien nganh)) - canh tranh cua dung cong dan gian tap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (vien nganh)) - canh tranh cua dung cong dan gian tap*.