Perhaps you should try some spelling variations:
thuong dong » phuong dong, tuong dong, chuong dong
thuong cong » thong cong, thuong con, truong cong
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
hai quan » tac quan
quan cao » quang cao, quan cau, quan ao

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - ((hanh trinh) OR (canh tranh)) luat ((thuong cong) or (thuong dong)) hai quan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh trinh) OR (canh tranh)) luat ((thuong cong) OR (thuong dong)) hai quan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((hanh trinh) OR (canh tranh)) luat ((thuong cong) or (thuong dong)) hai quan cao*".