Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ca hoi » cua hoi, xa hoi, co hoi
luc va » tuc va, loc va

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 hang ((ca hoi) or (cau hoi)). hieu va phat ((luc va) or (duc va)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang ((ca hoi) OR (cau hoi)). hieu va phat ((luc va) OR (duc va)) thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty hang ((ca hoi) or (cau hoi)). hieu va phat ((luc va) or (duc va)) thanh vai cua tre*.