Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh hang » thanh hang, hang hang, hanh han
cong tang » cong thang, cong tan, cong lang
thanh ban » thanh san, thanh bac, thanh bai
thanh van » thanh san, thanh toan, thanh phan

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

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