Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tang luan » dung luan
theo cuu » theo chu, khao cuu, thao cua
cong san » cong tac
san than » sang than, san thanh, ban than
than man » than ma, thanh san, tran manh
hang ca » hang va, nang cao, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo cuu van - hanh ((hang ca) or (tang luan)) nhung cong san than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cuu van - hanh ((hang ca) OR (tang luan)) nhung cong san than man.
• Adding a wildcard symbol may retrieve word variants: theo cuu van - hanh ((hang ca) or (tang luan)) nhung cong san than man*.