Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
thien anh » thien danh, tien anh, thien chanh
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
cong toan » cong tan, cong hoan, cong tuan
can cau » ban cau, ca cau, cac cau
van cau » van dau, van hau, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien anh) OR (thien thanh)) - canh tranh van nhung cong toan ((can cau) or (van cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (thien thanh)) - canh tranh van nhung cong toan ((can cau) OR (van cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) OR (thien thanh)) - canh tranh van nhung cong toan ((can cau) or (van cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) OR (thien thanh)) - canh tranh van nhung cong toan ((can cau) or (van cau))*.