Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
x hoi » o hoi, x ho, 5 hoi

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 ((x hoi) OR (xa hoi)). ((hieu ve) or (hieu va)) pham duc va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x hoi) OR (xa hoi)). ((hieu ve) OR (hieu va)) pham duc va hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((x hoi) OR (xa hoi)). ((hieu ve) or (hieu va)) pham duc va hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) OR (xa hoi)). ((hieu ve) or (hieu va)) pham duc va hanh lai cua tre*.