Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thanh tung » thanh cong
hang nong » thang long
hoc hieu » hoc thieu, hoc hien, doc hieu
hieu luc » hieu luat, hieu qua
tung cua » trung cua, tuong cua, dung cua
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 luc - thanh tung cua ((nhung cong) or (((hang nong) OR (han tong)))) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu luc - thanh tung cua ((nhung cong) OR (((hang nong) OR (han tong)))) dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu luc - thanh tung cua ((nhung cong) or (((hang nong) OR (han tong)))) dan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu luc - thanh tung cua ((nhung cong) or (((hang nong) OR (han tong)))) dan than cau*.