Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van hau » van ha, van hai, van dau
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
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 ky nang x hoi. hieu ((van nam) or (van hau)) duc va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ((van nam) OR (van hau)) duc va hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((van nam) or (van hau)) duc va hanh di cua viet*.