Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
phat xuc » chat xuc, phat xuat, phap xu
tu cach » tu cac
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
o hoc » co hoc, mo hoc, so hoc
o hoi » co hoi, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thuoc sach)) ky nang ((o hoi) OR (o hoc)). hieu va phat xuc van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuoc sach)) ky nang ((o hoi) OR (o hoc)). hieu va phat xuc van hanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thuoc sach)) ky nang ((o hoi) OR (o hoc)). hieu va phat xuc van hanh dai cua tre*".