Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tranh » canh tranh, hanh trinh, hanh trang
thong cong » trong cong, thong thong, phong chong
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
tong cong » trong cong, cong cong, dung cong
tran manh » tran minh, tran thanh, tran van
than man » than ma, thanh san, than phan

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 tranh cua ((thong cong) OR (tong cong)) san ((than man) OR (tran manh))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh tranh cua ((thong cong) OR (tong cong)) san ((than man) or (tran manh))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh tranh cua ((thong cong) OR (tong cong)) san ((than man) or (tran manh))*.