Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
va cau » van cau, va cac, va dau
tuc va » thuc va, truc va, tuc xa
luc va » loc va
di va » dai va, di vao, doi 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: tu sach y nang xa hoi. hieu va cau ((((tuc va) OR (duc va))) OR (luc va)) hanh di va triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu va cau ((((tuc va) or (duc va))) or (luc va)) hanh di va triet*.