Perhaps you should try some spelling variations:
doc hieu » hoc thieu, hoc hien
binh dan » minh danh, binh dinh, binh luan
dan thuc » dan toc, am thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan cong » dang cong, van cong, dan dong
cong hat » cong nhat, cong chat, cong ha
hat dan » hat van, mat dan, nhat danh
dan lap » phan lap, dan luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) sang - binh dan thuc dan cong hat dan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sang - binh dan thuc dan cong hat dan lap*.