Perhaps you should try some spelling variations:
toan luc » than luc, toan buc, toan duc
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
vai cua » dai cua, hai cua, lai cua
va hanh » va thanh, va danh, ban hanh
va toan » van toan, bai toan, tap toan
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang

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) or (toc sach)) v nang xa hoi. lieu va toan luc ((va hanh) or (van hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v nang xa hoi. lieu va toan luc ((va hanh) OR (van hanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) v nang xa hoi. lieu va toan luc ((va hanh) or (van hanh)) vai cua tre*.