Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hanh tranh » canh tranh, hanh trinh, hanh trang
tieu sang » chieu sang, tieu dung, tiem nang
trinh vat » trinh van, trinh luat, sinh vat
tranh va » tranh van, trang va, trinh va
tinh va » tich va, trinh van, tinh gia

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sang - hanh tranh va thuong cong ((tinh va) OR (trinh vat)) ban~".
• Adding a wildcard symbol may retrieve word variants: theo tieu sang - hanh tranh va thuong cong ((tinh va) OR (trinh vat)) ban*.