Perhaps you should try some spelling variations:
chat doc » chat hoc, chau doc, thuat doc
cua viet » hoa viet, cua vat, cua dieu
hieu van » hieu va, thien van, lieu va
chat soc » cham soc, chat hoc, chat song
va dinh » van dinh, va kinh, va tinh
dinh di » dinh du, dinh vi, danh di
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ca viet » va viet, co viet, hoa viet

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van ((chat soc) OR (chat doc)) va dinh di ((cua viet) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van ((chat soc) or (chat doc)) va dinh di ((cua viet) OR (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van ((chat soc) or (chat doc)) va dinh di ((cua viet) OR (ca viet))*.