Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
doi cua » dai cua, hoi cua, dong cua
y nang » ky nang, ly nang, v nang
xuc va » tuc va, luc va, xac va
di cua » dai cua, de cua, do cua

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 y nang xa hoi. hieu van cau ((xuc va) OR (duc va)) hanh ((di cua) OR (doi cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu van cau ((xuc va) or (duc va)) hanh ((di cua) OR (doi cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van cau ((xuc va) or (duc va)) hanh ((di cua) OR (doi cua)) triet*.