Perhaps you should try some spelling variations:
sanh khoa » anh khoa, san khoa, sinh khoa
hoc thieu » toc thieu, hoc hien
khoa hoc » hoa hoc
thai cua » than cua, tai cuc, tri cua
so sanh » do sanh
khi cua » chi cua
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: so sanh khoa hoc thieu ((khi cua) OR (thai cua)) ets : nhung bai ((doc vi) or (doc va)) đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh khoa hoc thieu ((khi cua) OR (thai cua)) ets : nhung bai ((doc vi) OR (doc va)) đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh khoa hoc thieu ((khi cua) OR (thai cua)) ets : nhung bai ((doc vi) or (doc va)) đai".
• Adding a wildcard symbol may retrieve word variants: so sanh khoa hoc thieu ((khi cua) OR (thai cua)) ets : nhung bai ((doc vi) or (doc va)) đai*.