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