Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
manh chung » manh hung, lanh chung, doanh chung
chieu xanh » chieu sach, chieu sang, chieu tinh
chau tinh » cuu tinh, ha tinh, cua tinh
cu thuong » cua thuong, cuu thuong, tu thuong
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) or (chau tinh)) - manh chung cu thuong cong ((tap toan) OR (tap quan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chau tinh)) - manh chung cu thuong cong ((tap toan) OR (tap quan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chau tinh)) - manh chung cu thuong cong ((tap toan) OR (tap quan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chau tinh)) - manh chung cu thuong cong ((tap toan) OR (tap quan)) cau*.