Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
cong manh » cong danh, duong manh, hoang manh
hanh ban » thanh ban, hang ban, hanh san
cua dang » cua cong, cua ban
toan tap » toan ban
ban cua » ban quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (nhieu tang)) - hanh ban cua dang ((cong manh) OR (cong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (nhieu tang)) - hanh ban cua dang ((cong manh) OR (cong thanh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) or (nhieu tang)) - hanh ban cua dang ((cong manh) OR (cong thanh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (nhieu tang)) - hanh ban cua dang ((cong manh) OR (cong thanh)) toan tap*.