Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
cao duc » dao duc, cao suc, giao duc
vai cua » dai cua, hai cua, lai cua
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) OR (sach y)) nang xa hoi. ((hieu va) or (lieu va)) cao duc van thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang xa hoi. ((hieu va) OR (lieu va)) cao duc van thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) nang xa hoi. ((hieu va) or (lieu va)) cao duc van thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) nang xa hoi. ((hieu va) or (lieu va)) cao duc van thanh vai cua tre*.