Perhaps you should try some spelling variations:
cham doc » cham soc, chau doc, pham duc
chat doc » chat hoc, chau doc, thuat doc
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
lai cua » dai cua, hai cua, thai cua
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

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