Perhaps you should try some spelling variations:
cham sao » cham vao, cham soc, nam sao
ban hanh » ban hang
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sao ban » tao ban, cao bang, tao bang
ma hoi » xa hoi, ma hoa, me hoi
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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 cac ky tang ((ma hoi) OR (mai hoi)). hieu va cham sao ban hanh ((vi cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky tang ((ma hoi) or (mai hoi)). hieu va cham sao ban hanh ((vi cua) OR (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky tang ((ma hoi) or (mai hoi)). hieu va cham sao ban hanh ((vi cua) OR (di cua)) tre*.