Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
tran van » luan van
van dung » van dong, xay dung, tin dung
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 tran van 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 tran van dung cong ((dan toan) OR (van toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh tran van dung cong ((dan toan) or (van toan)) cau*.