Perhaps you should try some spelling variations:
thanh thai » thanh tai, nhanh thai, thanh thao
thanh hai » thanh phan, thanh hoa, thanh san
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cai hoi » cau hoi, dai hoi, cai hoa
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: su sach ky nang ((cai hoi) or (dai hoc)). hieu va cham duc va ((thanh thai) OR (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((cai hoi) OR (dai hoc)). hieu va cham duc va ((thanh thai) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((cai hoi) or (dai hoc)). hieu va cham duc va ((thanh thai) OR (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((cai hoi) or (dai hoc)). hieu va cham duc va ((thanh thai) OR (thanh hai)) cua tre*.