Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
bang song » nang song
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
ban toan » ban than, van toan, bao toan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu xanh - anh tang cua ((nhung cong) or (bang song)) ((ban toan) OR (bai toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu xanh - anh tang cua ((nhung cong) OR (bang song)) ((ban toan) OR (bai toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu xanh - anh tang cua ((nhung cong) or (bang song)) ((ban toan) OR (bai toan)) tap".
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - anh tang cua ((nhung cong) or (bang song)) ((ban toan) OR (bai toan)) tap*.