Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
dinh su » dinh so, hinh su, dinh cu
tu sach » thu sach, su sach, te sach
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
qua cac » cua cac
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho
su va » su van, tu 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 ((tu nang) OR (tu nong)) x hoi. hieu qua cac ((xuc va) OR (tuc va)) dinh su va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) or (tu nong)) x hoi. hieu qua cac ((xuc va) OR (tuc va)) dinh su va triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) or (tu nong)) x hoi. hieu qua cac ((xuc va) OR (tuc va)) dinh su va triet*.