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

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 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 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 nang xa hoi. ((hieu va) or (lieu va)) cao duc van thanh vai cua tre*.