Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu cua cac ((xuc va) OR (tuc va)) hanh ((vi cua) OR (di cua)) tre~.
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang x hoi. hieu cua cac ((xuc va) or (tuc va)) hanh ((vi cua) or (di cua)) tre*.