Perhaps you should try some spelling variations:
tang luan » dung luan
hang cong » dang cong, hang nong, bang cong
tran manh » tran minh, tran thanh, tran van
khao cuu » cham cuu, chao chu, kho cua
hang cua » mang cua, hang ca, huong cua
cong san » cong tac
than man » than ma, thanh san, than phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: khao cuu van - hanh ((hang cua) or (tang luan)) hang cong san ((than man) OR (tran manh))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: khao cuu van - hanh ((hang cua) OR (tang luan)) hang cong san ((than man) OR (tran manh)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "khao cuu van - hanh ((hang cua) or (tang luan)) hang cong san ((than man) OR (tran manh))".
• Adding a wildcard symbol may retrieve word variants: khao cuu van - hanh ((hang cua) or (tang luan)) hang cong san ((than man) OR (tran manh))*.