Perhaps you should try some spelling variations:
khoa thuoc » khong thuoc, nha thuoc, hoc thuoc
hoc sach » hoc sinh, hoc cac, hoc anh
khoa hoc » hoa hoc
hieu chi » hieu cac
hieu moi » nhiem moi, hieu so, hieu bo
nhung bo » nhung bi, nhung bai, nhung don
bo hon » bo ho, bo ion, ro hon
hon vi » chon vi, don vi, hon ai

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

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