Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
cong thanh » dong thanh, cong trinh, cong tan
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 san » cong tac
toan tap » toan ban

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 - hanh tranh cua trung ((cong san) or (cong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh tranh cua trung ((cong san) OR (cong thanh)) toan tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh tranh cua trung ((cong san) or (cong thanh)) toan tap*.