Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
cua thuong » cua truong, cua phuong, ca thuong
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, 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: theo chieu sach - ((hanh trang) or (hanh trinh)) cua thuong cong ((dan than) OR (van than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((hanh trang) OR (hanh trinh)) cua thuong cong ((dan than) OR (van than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((hanh trang) or (hanh trinh)) cua thuong cong ((dan than) OR (van than)) cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh trang) or (hanh trinh)) cua thuong cong ((dan than) OR (van than)) cao*.