Perhaps you should try some spelling variations:
khoa thuoc » khong thuoc, khoa hoc, nha thuoc
thieu chi » thieu nhi, hieu chi, thu chi
nhung bo » nhung bi, nhung bai, nhung don
tieu chi » hieu chi, trien chi, dieu chim
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
uoc li » duoc li, hoc li, uoc lien
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: ((tu sach) or (su sach)) khoa thuoc ((thieu chi) OR (tieu chi)) cua ets : nhung bo uoc li đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) khoa thuoc ((thieu chi) OR (tieu chi)) cua ets : nhung bo uoc li đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) khoa thuoc ((thieu chi) OR (tieu chi)) cua ets : nhung bo uoc li đai".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) khoa thuoc ((thieu chi) OR (tieu chi)) cua ets : nhung bo uoc li đai*.