Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
vai cua » dai cua, hai cua, lai cua
soc van » hoc van, oc van, sac van
va chat » van chat, va phat, cao chat
va cham » va tham
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
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: toc sach ty ((nang xa) OR (nang ma)) hoi. hieu ((va cham) or (va chat)) soc van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((nang xa) OR (nang ma)) hoi. hieu ((va cham) OR (va chat)) soc van hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty ((nang xa) OR (nang ma)) hoi. hieu ((va cham) or (va chat)) soc van hanh vai cua tre*".