Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
thai cua » than cua, tai cuc, tri cua
su sach » so sach, vu sach
va danh » va dinh, va hanh, dia danh
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cai hoi » dai hoi, cai hoa, lai hoi
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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 danh) OR (va dan)) thai 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 va cham duc ((va danh) OR (va dan)) thai 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 va cham duc ((va danh) OR (va dan)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((cai hoi) or (cau hoi)). hieu va cham duc ((va danh) OR (va dan)) thai cua tre*.