Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
trinh su » trinh tu, trinh san, trinh cau
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, toan cau
phan lap » phan dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - canh trinh su dung cong dan ((((phan cau) or (phan tu))) or (phan lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh trinh su dung cong dan ((((phan cau) OR (phan tu))) OR (phan lap)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh trinh su dung cong dan ((((phan cau) or (phan tu))) or (phan lap))*.