Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban
hieu va » lieu va

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