Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien danh
thanh tung » thanh cong
thien anh » thien danh, tien anh, thien thanh
tong cong » trong cong, cong cong, dung cong
tung cua » trung cua, tuong cua, dung cua
cua tong » cua cong, cua dong, cua nong
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: toc ((thieu xanh) OR (thien anh)) - thanh tung cua tong cong ((tap toan) or (tap quan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu xanh) OR (thien anh)) - thanh tung cua tong cong ((tap toan) OR (tap quan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu xanh) OR (thien anh)) - thanh tung cua tong cong ((tap toan) or (tap quan)) tap".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu xanh) OR (thien anh)) - thanh tung cua tong cong ((tap toan) or (tap quan)) tap*.