Perhaps you should try some spelling variations:
hieu nghe » hiem ngheo, nhiem nghe, hieu he
lieu nghe » lieu nhe, lieu nghien, lieu nha
mai khoi » mai khoa, tai khoa, cac khoi
danh sai » dung sai, danh bat, danh dau
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » dai hoi, lai hoi, mai doi
ha danh » han danh, hoa danh, ha anh
sai cua » dai cua, hai cua, lai cua
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) OR (lieu nghe)) nam thu ha 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) OR (lieu nghe)) nam thu ha 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) OR (lieu nghe)) nam thu ha danh sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) or (mai khoi)). ((hieu nghe) OR (lieu nghe)) nam thu ha danh sai cua tre*.