Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
vai cau » va cau, van cau, vai cac
dao vai » dao van, dao va, dao bai
cac toc » cac toi, cac nuoc, cac thoi
cac tuc » cac tu, cac tac, cac nuoc
cach tu » cach thuc
te cach » ve cach, te sach, tu cach
hieu ve » hieu va, hieu van
mang xa » lang xa, mang may, dang xay

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cach tu ((mang xa) or (nang x)) hoi. hieu ve ((cac tuc) OR (cac toc)) ca dao vai cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach tu ((mang xa) OR (nang x)) hoi. hieu ve ((cac tuc) OR (cac toc)) ca dao vai cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cach tu ((mang xa) or (nang x)) hoi. hieu ve ((cac tuc) OR (cac toc)) ca dao vai cau theo".
• Adding a wildcard symbol may retrieve word variants: te cach tu ((mang xa) or (nang x)) hoi. hieu ve ((cac tuc) OR (cac toc)) ca dao vai cau theo*.