Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
hanh vai » hanh vi, hanh va, hanh tai
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cao thuc » cao thuoc, bao thuc, can thuc
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
va cao » va cac, va co, va dao

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) OR (thuoc sach)) y ((nang xa) or (nang ma)) hoi. lieu va cao thuc dan hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) y ((nang xa) OR (nang ma)) hoi. lieu va cao thuc dan hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) y ((nang xa) or (nang ma)) hoi. lieu va cao thuc dan hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) y ((nang xa) or (nang ma)) hoi. lieu va cao thuc dan hanh vai cua tre*.