Perhaps you should try some spelling variations:
khoai chau » khoa chau, khoa phau, hai chau
cong thanh » dong thanh, cong trinh, cong tan
cong cua » cong cu, dong cua, huong cua
cua tong » cua cong, cua dong, cua nong
cong tac » cong ty
phan cau » phan dau, phan cac, phan tu
ha chau » hat chau, a chau, lai chau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((khoai chau) or (ha chau)) tinh - thanh cong cua tong ((cong tac) or (cong thanh)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((khoai chau) OR (ha chau)) tinh - thanh cong cua tong ((cong tac) OR (cong thanh)) phan cau.
• Adding a wildcard symbol may retrieve word variants: ((khoai chau) or (ha chau)) tinh - thanh cong cua tong ((cong tac) or (cong thanh)) phan cau*.