Perhaps you should try some spelling variations:
hien khanh » hien nhanh, dien khanh, thien thanh
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan nong » luan nang, luan cong, luan dong
nong cong » cong cong, tong cong, nang cong
cong khac » cong khan, cong khanh, cong tac
khac dai » khac di, khac trai, khac duan
dai benh » tai benh, doan benh, tri benh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien khanh) or (hien hanh)) - hanh tang luan nong cong khac dai benh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien khanh) OR (hien hanh)) - hanh tang luan nong cong khac dai benh*.