Perhaps you should try some spelling variations:
dong thieu » dong trieu, dong hieu, dong tieu
cong thuc » cong tac
thuc dung » thuoc dung, thuy dung, tuc dung
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan khoa » toan khoa, tran khoa, san khoa
khoa tap » khoa tai, khoa than, hoc tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc thieu) or (dong thieu)) tinh - thanh cong thuc dung cong tan khoa tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc thieu) OR (dong thieu)) tinh - thanh cong thuc dung cong tan khoa tap.
• Adding a wildcard symbol may retrieve word variants: ((toc thieu) or (dong thieu)) tinh - thanh cong thuc dung cong tan khoa tap*.