Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
phuc van » thuc van, phuc va, chuc van
cau phuc » cau truc, chau phu, huu phuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
hoc cac » hoc cao
ve cau » ke cau, va cau, ve cac
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nuoc sach) or (hoc cac)) ky nang ((o hoi) or (o hoc)). hieu ve cau phuc van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nuoc sach) OR (hoc cac)) ky nang ((o hoi) OR (o hoc)). hieu ve cau phuc van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((nuoc sach) or (hoc cac)) ky nang ((o hoi) or (o hoc)). hieu ve cau phuc van hanh dai cua tre*.