Perhaps you should try some spelling variations:
dung thuong » dung trong, hang thuong, dung thuoc
cong thuong » hang thuong
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
trinh chan » trinh chuan, trinh han, trinh phan
lan toan » van toan, dan toan, lap toan
toan cau » 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 (chieu xanh)) - hanh trinh chan ((dung thuong) OR (cong thuong)) lan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - hanh trinh chan ((dung thuong) OR (cong thuong)) lan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (chieu xanh)) - hanh trinh chan ((dung thuong) OR (cong thuong)) lan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu xanh)) - hanh trinh chan ((dung thuong) OR (cong thuong)) lan toan cau*.