Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach ky » sach y, sach ty, sach kem
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
sac ky » cac ky, sai ky
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) OR (sac ky)) nang x hoi. hieu ((van nam) or (van cau)) duc va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. hieu ((van nam) OR (van cau)) duc va hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang x hoi. hieu ((van nam) or (van cau)) duc va hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang x hoi. hieu ((van nam) or (van cau)) duc va hanh di cua viet*.