Perhaps you should try some spelling variations:
hieu cua » hieu qua, bieu cua, hieu ca
dieu cua » dieu tra
va triet » va thiet, va trien, ve triet
so sanh » do sanh
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
cac loc » cac lop, cac toc, cac hoc
va hanh » van hanh, va thanh, va danh
loc va » hoc va, luc va
vi va » vi van, vai va, vu 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: so sanh ((ky lang) OR (ky tang)) xa hoi. ((hieu cua) OR (dieu cua)) cac loc va hanh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ((ky lang) or (ky tang)) xa hoi. ((hieu cua) OR (dieu cua)) cac loc va hanh vi va triet~".
• Adding a wildcard symbol may retrieve word variants: so sanh ((ky lang) or (ky tang)) xa hoi. ((hieu cua) OR (dieu cua)) cac loc va hanh vi va triet*.