Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, cuoc cach, cuon sach
hanh dai » hanh tai, hanh dao, vanh dai
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
phuc van » thuc van, phuc va, chuc van
cua tre » cua te, cuu tre, cua triet
nang ho » nang hoc, nang co, tang ho
ve cac » va cac, vien cac
ho hoi » hoc hoi, hoa hoi, hoi hoi
ve cau » ke cau, va cau, le cau

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