Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
ban hanh » ban hang
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
va chat » van chat, va phat, hoa chat
vai cua » dai cua, hai cua, lai cua
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: te sach ky nang ma hoa. hieu ((va chat) OR (cao chat)) xuc ((va thanh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoa. hieu ((va chat) OR (cao chat)) xuc ((va thanh) OR (ban hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoa. hieu ((va chat) OR (cao chat)) xuc ((va thanh) or (ban hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoa. hieu ((va chat) OR (cao chat)) xuc ((va thanh) or (ban hanh)) vai cua tre*.