Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
cong san » cong tac
mang va » mang vua, bang va, dang va
san van » tan van, luan van, tran van
van tai » von tai, van tuan

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 - hanh ((mang va) or (hang va)) nhung cong san van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu xanh - hanh ((mang va) OR (hang va)) nhung cong san van tai.
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - hanh ((mang va) or (hang va)) nhung cong san van tai*.