Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
cham duc » pham duc, cham soc, pham duy
va thanh » gia thanh, ban thanh, va tinh
than cua » nhan cua, thai cua, ban cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cai hoi » cau hoi, dai hoi, cai hoa
dai hoa » dai khoa, dai hoc, dai hoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
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 hoa)). hieu va cham duc va thanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((cai hoi) OR (dai hoa)). hieu va cham duc va thanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((cai hoi) or (dai hoa)). hieu va cham duc va thanh than cua tre*.