Perhaps you should try some spelling variations:
hieu nghe » lieu nghe, hiem ngheo, nhiem nghe
nghe nam » nghe lam, nghiep nam, nghe nano
han danh » van danh, phan dang, nhan dang
mai khoi » mai khoa, tai khoa, cac khoi
sai cua » dai cua, hai cua, lai cua
ha danh » hoa danh, ha anh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » dai hoi, lai hoi, mai doi
cua tre » cua te, cuu tre, cua triet

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 ((mai hoi) or (mai khoi)). hieu nghe nam thu ((ha danh) OR (han danh)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai hoi) OR (mai khoi)). hieu nghe nam thu ((ha danh) OR (han danh)) sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((mai hoi) or (mai khoi)). hieu nghe nam thu ((ha danh) OR (han danh)) sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) or (mai khoi)). hieu nghe nam thu ((ha danh) OR (han danh)) sai cua tre*.