Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
cong thanh » dong thanh, cong trinh, cong tan
dong cong » duong cong, dung cong, dang cong
tranh ha » thanh ha, trang ha, trinh ha
ha dong » hoat dong, van dong
ban cau » bang cau, van cau, ban dau
ban can » ban dan, ban hang, ban hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (nhieu tang)) - canh tranh ha dong cong thanh ((ban cau) or (ban can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (nhieu tang)) - canh tranh ha dong cong thanh ((ban cau) OR (ban can)).
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (nhieu tang)) - canh tranh ha dong cong thanh ((ban cau) or (ban can))*.