Perhaps you should try some spelling variations:
hieu sau » hieu suat, tieu su, hieu va
dang dai » dang hai, dang bai, dang dan
phat xuc » chat xuc, phat xuat, phap xu
dinh di » dinh du, dinh vi, danh di
va dinh » van dinh, va kinh, va tinh
cua tuc » cua duc, cua thuoc, luat tuc
hieu su » tieu su, hieu so, hieu suat
dai hoi » dai hoc, dai hai, dai moi
ky dang » ky nang, ky danh
cai ky » cao ky, cac ky, cam ky
xuc va » duc va, tuc va, luc va
cua tu » cua su, cua cu, cua te
tu cai » tu cac, tu can, tu bai

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 cai ky dang dai hoi. ((hieu su) OR (hieu sau)) phat xuc va dinh di ((cua tu) OR (cua tuc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky dang dai hoi. ((hieu su) OR (hieu sau)) phat xuc va dinh di ((cua tu) or (cua tuc))~".
• Adding a wildcard symbol may retrieve word variants: tu cai ky dang dai hoi. ((hieu su) OR (hieu sau)) phat xuc va dinh di ((cua tu) or (cua tuc))*.