Perhaps you should try some spelling variations:
thuoc thieu » toc thieu, hoc thieu, thuc hieu
khoa thuoc » khong thuoc, khoa hoc, nha thuoc
thieu khi » thieu nhi, tien khi, hieu chi
nhung bi » nhung bai
nhung gi » nhung bai
tu sach » thu sach, te sach, tu cach
khi cua » chi cua, thai cua
su sach » so sach, vu sach
doc vi » hoc vi, don vi, doc va

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 khi cua ets : ((nhung gi) OR (nhung bi)) doc vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) khoa thuoc thieu khi cua ets : ((nhung gi) OR (nhung bi)) doc vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) khoa thuoc thieu khi cua ets : ((nhung gi) OR (nhung bi)) doc vi đai".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) khoa thuoc thieu khi cua ets : ((nhung gi) OR (nhung bi)) doc vi đai*.