Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
tong cong » trong cong, cong cong, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
trinh ha » trinh han, trinh hoa, trinh nha
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan
ha tong » han tong, ha dong, ha tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - hanh trinh ha tong cong ((dan than) OR (van than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh trinh ha tong cong ((dan than) OR (van than)) cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh trinh ha tong cong ((dan than) OR (van than)) cau*.