Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
sach tham » sach nha
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
vai cua » dai cua, hai cua, lai cua
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
luc va » duc 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: toc sach tham ((nang x) or (nang cao)) hoi. ((hieu va) OR (hieu qua)) cac luc va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tham ((nang x) OR (nang cao)) hoi. ((hieu va) OR (hieu qua)) cac luc va thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tham ((nang x) or (nang cao)) hoi. ((hieu va) OR (hieu qua)) cac luc va thanh vai cua tre*".