Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cai hoi » dai hoi, cai hoa, lai hoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
cuc tre » duc tre, cua tre, cuu tre

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 va cham duc va hanh tai cuc tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((cai hoi) OR (cau hoi)). hieu va cham duc va hanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((cai hoi) OR (cau hoi)). hieu va cham duc va hanh tai cuc tre*.