Perhaps you should try some spelling variations:
chat doc » chat hoc, chau doc, thuat doc
van hanh » van thanh, ban hanh, van anh
cham doc » cham soc, chau doc, pham duc
so sach » so sanh, bo sach, co sach
lai cua » dai cua, hai cua, lai chau
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. hieu ve ((cham doc) or (chat doc)) ((va hanh) OR (van hanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. hieu ve ((cham doc) OR (chat doc)) ((va hanh) OR (van hanh)) lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. hieu ve ((cham doc) or (chat doc)) ((va hanh) OR (van hanh)) lai cua tre*".