Perhaps you should try some spelling variations:
tieu cuoi » kieu cuoi, tieng cuoi, dieu tuoi
khoa toc » khoa hoc, hoa toc, khoa thuoc
toc tieu » toc thieu, hoc tieu, hoc thieu
cuoi cua » hoi cua, doi cua, co cua
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
doc vi » hoc vi, don vi, doc viet
doc va » duoc va, hoc va, duc 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 tieu cuoi cua ets : nhung bai ((doc vi) OR (doc va)) đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) khoa toc tieu cuoi cua ets : nhung bai ((doc vi) OR (doc va)) đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) khoa toc tieu cuoi cua ets : nhung bai ((doc vi) OR (doc va)) đai".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) khoa toc tieu cuoi cua ets : nhung bai ((doc vi) OR (doc va)) đai*.