Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
dinh su » dinh so, hinh su, dinh cu
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu ve » hieu va
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.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang x hoi. ((hieu ve) OR (hieu van)) cam ((xuc va) or (tuc va)) dinh su va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu ve) OR (hieu van)) cam ((xuc va) OR (tuc va)) dinh su va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. ((hieu ve) OR (hieu van)) cam ((xuc va) or (tuc va)) dinh su va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu ve) OR (hieu van)) cam ((xuc va) or (tuc va)) dinh su va triet*.