Perhaps you should try some spelling variations:
cong thuong » hang thuong
quang cong » quang cuong, quang dong, quang hoang
thuong dan » huong dan, thuong han, thuong dam
hieu manh » chieu xanh, hieu nganh, hien hanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (dieu hanh)) - hanh tinh quang cong thuong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (dieu hanh)) - hanh tinh quang cong thuong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (dieu hanh)) - hanh tinh quang cong thuong dan toan ban*.