Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh qua » trinh quan, trinh cua, trinh quang
dung cong » dung trong
dan toan » dan than, manh toan, xuan toan
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 hien xanh - hanh trinh qua ((nhung cong) OR (dung cong)) ((dan toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh trinh qua ((nhung cong) OR (dung cong)) ((dan toan) OR (van toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh trinh qua ((nhung cong) OR (dung cong)) ((dan toan) or (van toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh trinh qua ((nhung cong) OR (dung cong)) ((dan toan) or (van toan)) cau*.