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

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: ((su anh) OR (sua 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) OR (sua 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) OR (sua anh)) khoa hoc ((hien khi) or (khien khi)) cua ets : nhung bot hoc vi đai*.