Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tranh » canh tranh, hanh trang, lanh tranh
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
qua dung » quang dung, su dung, qua song
cong san » cong tac
phan cau » phan dau, phan cac, phan tu
than cap » khan cap, thanh lap, thanh cac

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 - ((hanh tranh) or (hanh trinh)) qua dung cong san ((phan cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh tranh) OR (hanh trinh)) qua dung cong san ((phan cau) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh tranh) or (hanh trinh)) qua dung cong san ((phan cau) or (than cap))*.