Perhaps you should try some spelling variations:
thien van » thi van
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
hieu van » lieu va, hieu ve
vai cua » dai cua, hai cua, lai cua
duc van » duc va, duc tan, duc manh
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang x hoi. ((((hieu van) or (hieu va))) or (thien van)) cao duc van thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. ((((hieu van) OR (hieu va))) OR (thien van)) cao duc van thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. ((((hieu van) or (hieu va))) or (thien van)) cao duc van thanh vai cua tre*.