Perhaps you should try some spelling variations:
khien khi » khien phi, tien khi, bien khi
nhung bot » nhung bo, nhung bong, nhung buoc
anh khoa » doanh khoa, hang khoa
khoa hoc » hoa hoc
hien khi » tien khi, bien khi, hien khu
bot hoc » post hoc, bot khoa, buoc hoc
su anh » sua anh, vu anh, tu anh
hoc vi » hoc va, hoc viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su anh khoa hoc ((hien khi) OR (khien khi)) cua ets : nhung bot hoc vi đai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su anh khoa hoc ((hien khi) OR (khien khi)) cua ets : nhung bot hoc vi đai".
• Adding a wildcard symbol may retrieve word variants: su anh khoa hoc ((hien khi) OR (khien khi)) cua ets : nhung bot hoc vi đai*.