Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hanh tranh » canh tranh, hanh trinh, hanh trang
chi xanh » chi anh, chi danh, chi hanh
tranh va » tranh van, trang va, trinh va
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan
doi chi » doi khi

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 xanh - hanh tranh va thuong cong ((tap toan) OR (tap quan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - hanh tranh va thuong cong ((tap toan) OR (tap quan)) tap".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - hanh tranh va thuong cong ((tap toan) OR (tap quan)) tap*.