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

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 y ((nang xa) or (nang ma)) hoi. lieu va cao thuc dan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((nang xa) OR (nang ma)) hoi. lieu va cao thuc dan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((nang xa) or (nang ma)) hoi. lieu va cao thuc dan hanh vi cua tre*.