Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
trinh vat » trinh van, trinh luat, sinh vat
hoi hieu » hoi phieu, hoi tieu, moi hieu
ho hieu » ho chieu, nho hieu, co hieu
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho hieu) or (hoi hieu)) lang - canh trinh vat ((nhung cong) OR (thong cong)) dan can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoi hieu)) lang - canh trinh vat ((nhung cong) OR (thong cong)) dan can cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) or (hoi hieu)) lang - canh trinh vat ((nhung cong) OR (thong cong)) dan can cau".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (hoi hieu)) lang - canh trinh vat ((nhung cong) OR (thong cong)) dan can cau*.