Perhaps you should try some spelling variations:
dac khoa » dai khoa, dau khoa, cac khoan
toc hieu » toc thieu, doc hieu, hoc thieu
hieu khi » hieu chi, thieu nhi, khien khi
nhung bo » nhung bi, nhung bai, nhung don
khi cua » chi cua, thai cua
hoc vi » hoc va, hoc viet
ho vi » hoa vi, ho voi, hon vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((dac khoa) OR (da khoa)) toc hieu khi cua ets : nhung bo ((ho vi) or (hoc vi)) đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dac khoa) OR (da khoa)) toc hieu khi cua ets : nhung bo ((ho vi) OR (hoc vi)) đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((dac khoa) OR (da khoa)) toc hieu khi cua ets : nhung bo ((ho vi) or (hoc vi)) đai".
• Adding a wildcard symbol may retrieve word variants: hoc ((dac khoa) OR (da khoa)) toc hieu khi cua ets : nhung bo ((ho vi) or (hoc vi)) đai*.