Perhaps you should try some spelling variations:
cong thuong » hang thuong
hanh trang » thanh trung, canh tranh, hanh trinh
trang tuan » tran tuan, trung tuan, trong tuan
tuan cong » thuan cong, luan cong, tran cong
chi hanh » chi thanh, thi hanh, chi anh
van tan » van tuan, van ban, van thanh
van tai » von tai, van tuan

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 hanh) OR (chi nhanh)) - hanh trang tuan cong thuong ((van tan) or (van tai)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi hanh) OR (chi nhanh)) - hanh trang tuan cong thuong ((van tan) OR (van tai)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi hanh) OR (chi nhanh)) - hanh trang tuan cong thuong ((van tan) or (van tai)) tap".
• Adding a wildcard symbol may retrieve word variants: doi ((chi hanh) OR (chi nhanh)) - hanh trang tuan cong thuong ((van tan) or (van tai)) tap*.