Perhaps you should try some spelling variations:
thieu khi » thieu nhi, tien khi, hieu chi
khoa toc » khoa hoc, hoa toc, khoa thuoc
nhung gi » nhung bi, nhung bai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
khi cua » chi cua, thai cua
gi doc » giam doc, gian doc
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 toc thieu khi cua ets : nhung gi doc vi đai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) khoa toc thieu khi cua ets : nhung gi doc vi đai".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) khoa toc thieu khi cua ets : nhung gi doc vi đai*.