Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
co thuc » do thuc, co thua, mo thuc
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
va co » vo co

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