Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
sach thu » sach thue, sach thieu, sach tham
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tang ma » tang van
cua tre » cua te, cuu tre, cua triet
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 thu ((tang ma) OR (mang may)) hoi. hieu va cham ((luc va) or (duc va)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((tang ma) OR (mang may)) hoi. hieu va cham ((luc va) OR (duc va)) thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((tang ma) OR (mang may)) hoi. hieu va cham ((luc va) or (duc va)) thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((tang ma) OR (mang may)) hoi. hieu va cham ((luc va) or (duc va)) thanh vai cua tre*.