Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
toc sach » hoc sach, doc sach, thuoc sach
van thuc » va thuc, dan thuc, van thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (toc sach)) ky lang ha noi. hieu va van thuc van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (toc sach)) ky lang ha noi. hieu va van thuc van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (toc sach)) ky lang ha noi. hieu va van thuc van hanh dai cua tre*.