Perhaps you should try some spelling variations:
cong thuong » hang thuong
thuong tap » thuong gap, thuong thay, thuong mai
hanh dung » thanh dung, anh dung, hanh dong
luan cong » luat cong, luong cong, luan chung
chi xanh » chi anh, chi danh, chieu xanh
chi hanh » chi nhanh, chi thanh, thi hanh
tap toan » tap doan, tap quan, bai 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: doi ((chi xanh) or (chi hanh)) - hanh dung luan cong thuong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi xanh) OR (chi hanh)) - hanh dung luan cong thuong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chi xanh) or (chi hanh)) - hanh dung luan cong thuong tap toan cau*.