Perhaps you should try some spelling variations:
khoa thuoc » khong thuoc, hoc thuoc, khoa quoc
nha thuoc » nha nuoc, nhan thuc, nha hoc
hoc sach » hoc sinh, hoc cac, hoc anh
khoa hoc » hoa hoc
hieu chi » hieu cac, hieu moi
nhung ro » nhung bo, nhung don, nhung loi
chi cua » chi cuc, khi cua, cuoi cua
ro hon » ro han, bo 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 (nha thuoc))) or (khoa hoc)) hieu chi cua ets : nhung ro hon vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((((khoa thuoc) OR (nha thuoc))) OR (khoa hoc)) hieu chi cua ets : nhung ro hon vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((((khoa thuoc) OR (nha thuoc))) or (khoa hoc)) hieu chi cua ets : nhung ro hon vi đai".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((((khoa thuoc) OR (nha thuoc))) or (khoa hoc)) hieu chi cua ets : nhung ro hon vi đai*.