Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » hanh chinh
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
cua thong » cua thuong, cua khong, cua tong
tam toan » tap toan, tam than, pham toan
huy toan » huy tran, huu toan, huy hoang

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

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