Perhaps you should try some spelling variations:
bang thanh » ban thanh, dang thanh, tang thanh
hien xanh » hien hanh, hien nhanh, chieu xanh
thanh tra » thanh toan, thanh hoa
dang cong » dung cong
bang than » ban than, sang than, bang nhan
van dang » van dong, van dung, van nang
tra van » tran van, ta van, trang van

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 hien xanh - thanh tra van dang cong ((bang than) OR (bang thanh)) cap~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - thanh tra van dang cong ((bang than) or (bang thanh)) cap*.