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
mai hoi » mai khoi, dai hoi, lai hoi
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 » xa hoi, ma hoa, me hoi

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 (mai 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 (mai hoi)). hieu ve cam ((xuc va) OR (luc va)) thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang ((ma hoi) or (mai 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 (mai hoi)). hieu ve cam ((xuc va) OR (luc va)) thanh vai cua tre*.