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 khi » hieu chi, thieu nhi, khien khi
nhung bi » nhung bai, nhung gi
khi cua » chi cua, thai cua
ho voi » hop voi, pho voi, hoc voi
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: hoc sach ((khoa thuoc) or (khoa hoc)) hieu khi cua ets : nhung bi ((ho voi) or (hoc vi)) đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((khoa thuoc) OR (khoa hoc)) hieu khi cua ets : nhung bi ((ho voi) OR (hoc vi)) đai.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((khoa thuoc) or (khoa hoc)) hieu khi cua ets : nhung bi ((ho voi) or (hoc vi)) đai*.