Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
te sach » toc sach
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, 5 hoi
so va » so van, so vat, su 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 y nang ((x hoi) or (x ho)). hieu ve cam ((xuc va) or (truc va)) dinh so va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((x hoi) OR (x ho)). hieu ve cam ((xuc va) OR (truc va)) dinh so va triet.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((x hoi) or (x ho)). hieu ve cam ((xuc va) or (truc va)) dinh so va triet*.