Perhaps you should try some spelling variations:
cong thuong » hang thuong
choi thuc » hoc thuc, hoi chuc, cho thue
thuc xanh » thuc hanh, thuc thanh, thuc dan
trang va » tran van, hang va
mai tan » hai tan, mai van, mai tat
tan cau » toan cau, van cau, tan ca
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: choi thuc xanh - hanh ((trang va) or (luan van)) cong thuong mai tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: choi thuc xanh - hanh ((trang va) OR (luan van)) cong thuong mai tan cau.
• Adding a wildcard symbol may retrieve word variants: choi thuc xanh - hanh ((trang va) or (luan van)) cong thuong mai tan cau*.