Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
cu tren » tu tren, dua tren
cam tuc » cam tu, nam thuc, dam thuc
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
tu cam » tu cham, tu cac, tu nam
cam ky » cao ky, cac ky
ma hoi » xa hoi, ma hoa, me hoi
vi cu » vi su, vi xu, vi du

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 cam ky nang ((ma hoi) OR (mai hoi)). hieu ve ((cam tuc) OR (cam xuc)) ban thanh vi cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cam ky nang ((ma hoi) or (mai hoi)). hieu ve ((cam tuc) OR (cam xuc)) ban thanh vi cu tren~".
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((ma hoi) or (mai hoi)). hieu ve ((cam tuc) OR (cam xuc)) ban thanh vi cu tren*.