Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham loc » cham soc, chon loc, cham o
te sach » toc sach
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, san viet
y nang » ky nang, ly nang, v nang
loc va » hoc va, luc va

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: ((te sach) OR (vu sach)) y nang xa hoi. hieu van cham loc va hanh vi ((ca viet) OR (hoa viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) y nang xa hoi. hieu van cham loc va hanh vi ((ca viet) OR (hoa viet))~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) y nang xa hoi. hieu van cham loc va hanh vi ((ca viet) OR (hoa viet))*.