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, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
dung cong » dung trong
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - hanh tranh cua ((thong cong) OR (dung cong)) ((dan than) OR (van toan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh tranh cua ((thong cong) OR (dung cong)) ((dan than) OR (van toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh tranh cua ((thong cong) OR (dung cong)) ((dan than) OR (van toan)) ban*.