Perhaps you should try some spelling variations:
cua viet » ca viet, cua vat, cua dieu
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dinh di » dinh du, dinh vi, danh di
luc va » duc va, tuc va
y nang » ky nang, ly nang, v nang
loc va » hoc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu ve cham ((luc va) OR (loc va)) dinh di ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu ve cham ((luc va) OR (loc va)) dinh di ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu ve cham ((luc va) OR (loc va)) dinh di ((cua viet) or (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu ve cham ((luc va) OR (loc va)) dinh di ((cua viet) or (hoa viet))*.