Perhaps you should try some spelling variations:
cong thuong » hang thuong
hanh trinh » canh tranh, hanh chinh
thieu xanh » chieu xanh, hieu manh, thien anh
trinh quan » tinh quang, trinh luat, trinh han
thuong dan » huong dan, thuong han, thuong dam
quan cong » qua cong, luan cong, quan dong
tien anh » tieng anh, tien manh, dien anh
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (tien anh)) - hanh trinh quan cong thuong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (tien anh)) - hanh trinh quan cong thuong dan toan cao*.