Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cua » doanh cua, manh cua
cua trung » cua truong, xuan trung, cua nhung
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
tran tan » tran tuan, tran van, tran thanh

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 - canh tranh cua trung ((cong tan) OR (cong tac)) tran tan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - canh tranh cua trung ((cong tan) OR (cong tac)) tran tan".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh cua trung ((cong tan) OR (cong tac)) tran tan*.