Perhaps you should try some spelling variations:
hieu vien » thieu nien, hieu tieng, nhieu viec
hieu viec » nhieu viec, hieu ve, sieu viet
hieu hien » bieu hien, dieu hien, chieu chien
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. ((((hieu vien) or (hieu viec))) or (hieu hien)) cac tu va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((((hieu vien) OR (hieu viec))) OR (hieu hien)) cac tu va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((((hieu vien) or (hieu viec))) or (hieu hien)) cac tu va hanh dai cua tre*.