Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
thai cua » than cua, tai cuc, tri cua
va thanh » gia thanh, ban thanh, va tinh
nang cai » nang cao, nang tai, nang cap
su sach » so sach
va tham » van tham, va thuat
va cham » va chat
cai hoi » cau hoi, dai hoi, cai hoa
vu sach » vu bach, vu khach
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) OR (vu sach)) ky nang cai hoi. hieu ((va cham) or (va tham)) duc va thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang cai hoi. hieu ((va cham) OR (va tham)) duc va thanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang cai hoi. hieu ((va cham) or (va tham)) duc va thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang cai hoi. hieu ((va cham) or (va tham)) duc va thanh thai cua tre*.