Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu quan » hieu qua, lieu quan, thien quan
trang cua » tranh cua, tang cua, trung cua
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, 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: ho ((chinh sach) or (hieu quan)) - hanh trang cua ((hang cong) or (hang nong)) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (hieu quan)) - hanh trang cua ((hang cong) OR (hang nong)) dan than cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu quan)) - hanh trang cua ((hang cong) or (hang nong)) dan than cao*.