Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
toc sach » hoc sach, doc sach, thuoc sach
vai cua » dai cua, hai cua, lai cua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa

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 ky dang ((ma hoi) or (lai hoi)). hieu ve cam ((xuc va) or (luc va)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang ((ma hoi) OR (lai hoi)). hieu ve cam ((xuc va) OR (luc va)) thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang ((ma hoi) or (lai hoi)). hieu ve cam ((xuc va) or (luc va)) thanh vai cua tre*.