Perhaps you should try some spelling variations:
thieu chi » thieu nhi, hieu chi, tieu chi
khoa toc » khoa hoc, hoa toc, khoa thuoc
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
chi cua » chi cuc, khi cua, cuoi cua
bo duoc » bo quoc, bo uoc, do duoc
co duoc » tao duoc, hoa duoc, hoc duoc

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