Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
trinh cua » tinh cua, trinh luat, trinh luan
dang nong » dang cong, hang nong, dang hoang
tang nong » hang nong, tang dong, tang mong
quan ban » quang ban, qua ban, quan van

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 hanh) OR (dieu hanh)) - hanh trinh cua ((dang nong) or (tang nong)) trinh quan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (dieu hanh)) - hanh trinh cua ((dang nong) OR (tang nong)) trinh quan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien hanh) OR (dieu hanh)) - hanh trinh cua ((dang nong) or (tang nong)) trinh quan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) OR (dieu hanh)) - hanh trinh cua ((dang nong) or (tang nong)) trinh quan ban*.