Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham duc » pham duc, cham soc, pham duy
thai cua » tai cuc, tri cua, dai cua
than cua » nhan cua, ban cua, gian cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cai hoi » dai hoi, cai hoa, lai hoi
va danh » va dinh, va dan, va hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((cai hoi) or (cau hoi)). hieu qua cham duc va danh ((thai cua) OR (than cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((cai hoi) OR (cau hoi)). hieu qua cham duc va danh ((thai cua) OR (than cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((cai hoi) or (cau hoi)). hieu qua cham duc va danh ((thai cua) OR (than cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((cai hoi) or (cau hoi)). hieu qua cham duc va danh ((thai cua) OR (than cua)) tre*.