Perhaps you should try some spelling variations:
vai cua » dai cua, hai cua, lai cua
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sach va » sach xa, sach ha, sach dao
sach v » sach y, sach 2, sach vay
va dap » va dao, va dau
ca dan » cac dan, ca dao
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach v) or (sach va)) nang xa hoi. hieu va cao tuc ((va dap) or (ca dan)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach va)) nang xa hoi. hieu va cao tuc ((va dap) OR (ca dan)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach va)) nang xa hoi. hieu va cao tuc ((va dap) or (ca dan)) vai cua tre*.