Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
thieu chi » thieu nhi, tieu chi, thu chi
nhung bo » nhung bi, nhung bai, nhung don
khoa toc » khoa hoc, hoa toc, khoa thuoc
hieu chi » hieu cac, hieu moi
uoc vi » hoc vi, doc vi, uoc va
bo uoc » bo duoc, bo quoc, mo uoc

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

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