Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
chat doc » chat hoc, chau doc, thuat doc
cham doc » cham soc, chau doc, pham duc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
hieu ve » hieu van
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
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: te sach ky nang xa hoi. ((hieu ve) or (hieu va)) ((cham doc) OR (chat doc)) va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. ((hieu ve) OR (hieu va)) ((cham doc) OR (chat doc)) va hanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. ((hieu ve) or (hieu va)) ((cham doc) OR (chat doc)) va hanh dai cua tre*".