Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
van cham » van chat, van tham, va cham
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
ty nang » ky nang, ty xang, ty hang
lai cua » dai cua, hai cua, lai chau
tu sach » thu sach, su sach, te sach
o hoi » co hoi, o hoc, o hai

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 ty nang ((5 hoi) or (o hoi)). hieu van cham duc van hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((5 hoi) OR (o hoi)). hieu van cham duc van hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((5 hoi) or (o hoi)). hieu van cham duc van hanh lai cua viet*.