Perhaps you should try some spelling variations:
tranh tuan » tran tuan, tranh luan, thanh tuan
chieu xanh » chieu sach, chieu sang, chieu tinh
tuan thong » toan thong, tran thong, tuan phong
thong cong » trong cong, tong cong, thong thong
hieu manh » hieu nganh, dieu hanh, hien hanh
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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 (hieu manh)) - canh tranh tuan thong cong ((tan toan) OR (tap toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (hieu manh)) - canh tranh tuan thong cong ((tan toan) OR (tap toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (hieu manh)) - canh tranh tuan thong cong ((tan toan) OR (tap toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (hieu manh)) - canh tranh tuan thong cong ((tan toan) OR (tap toan)) ban*.