Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
phat xuc » chat xuc, phat xuat, phap xu
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
tu cach » tu cac
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
o hoi » o hoc, 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 (thu sach)) ky nang ((o hoi) OR (co hoi)). 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 (thu sach)) ky nang ((o hoi) OR (co hoi)). 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 (thu sach)) ky nang ((o hoi) OR (co hoi)). hieu va phat xuc van hanh dai cua tre*".