Perhaps you should try some spelling variations:
khanh dinh » khanh linh, khanh vinh, hanh dinh
va khanh » van khanh, va thanh, vu khanh
cho hoc » co hoc, khoa hoc
dinh cu » dinh cuu, dinh chuc, dinh chau
sang ky » sang kyo, dang ky, tang ky
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
cam hoc » cao hoc, am hoc, cam hoa
san ky » van ky, dan ky, ban 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 ((san ky) OR (sang ky)) dang xa hoi. hieu ve ((cam hoc) or (cho hoc)) va khanh dinh cu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) dang xa hoi. hieu ve ((cam hoc) OR (cho hoc)) va khanh dinh cu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (sang ky)) dang xa hoi. hieu ve ((cam hoc) or (cho hoc)) va khanh dinh cu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (sang ky)) dang xa hoi. hieu ve ((cam hoc) or (cho hoc)) va khanh dinh cu tre*.