Perhaps you should try some spelling variations:
khanh dinh » khanh linh, khanh vinh, hanh dinh
vu khanh » vu thanh, van khanh, duy khanh
cao hoc » co hoc, cho hoc, chat hoc
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu van
dinh cu » dinh cuu, dinh chuc, dinh chau
hieu va » lieu va, hieu qua
cam hoc » am hoc, cam hoa, cac hoc
tu ban » thu ban, te ban
ban ky » van ky, dan ky
cu tre » cu tren, cua tre, cuu tre

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ky dang xa hoi. ((hieu ve) OR (hieu va)) ((cam hoc) or (cao hoc)) vu khanh dinh cu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky dang xa hoi. ((hieu ve) OR (hieu va)) ((cam hoc) OR (cao hoc)) vu khanh dinh cu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ban ky dang xa hoi. ((hieu ve) OR (hieu va)) ((cam hoc) or (cao hoc)) vu khanh dinh cu tre".
• Adding a wildcard symbol may retrieve word variants: tu ban ky dang xa hoi. ((hieu ve) OR (hieu va)) ((cam hoc) or (cao hoc)) vu khanh dinh cu tre*.