Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
chan cau » can cau, chinh cau, nhanh cau
phan cau » phan dau, phan cac, phan tu

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 manh - thanh trung cua thong ((cong san) or (cong ty)) ((chan cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - thanh trung cua thong ((cong san) OR (cong ty)) ((chan cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - thanh trung cua thong ((cong san) or (cong ty)) ((chan cau) or (phan cau))*.