Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
ban nang » ban hang, van nang, ban dang
hieu ban » hieu van, dieu ban, lieu ban
hoc sach » hoc sinh, hoc cac, hoc anh
nang xa » nang x, lang xa, nang ma
va hanh » va thanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
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: ((toc sach) OR (hoc sach)) v nang xa hoi. hieu ban nang luc ((va hanh) or (van hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) v nang xa hoi. hieu ban nang luc ((va hanh) OR (van hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) v nang xa hoi. hieu ban nang luc ((va hanh) or (van hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) v nang xa hoi. hieu ban nang luc ((va hanh) or (van hanh)) vai cua tre*.