Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lai cua » dai cua, hai cua, lai chau
so sach » so sanh, bo sach, co sach
hieu ve » hieu va
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
cua te » cua tu
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: ((tu sach) or (so sach)) ky nang x hoi. ((hieu ve) OR (hieu van)) cao duc va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky nang x hoi. ((hieu ve) OR (hieu van)) cao duc va hanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sach)) ky nang x hoi. ((hieu ve) OR (hieu van)) cao duc va hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky nang x hoi. ((hieu ve) OR (hieu van)) cao duc va hanh lai cua te*.