Perhaps you should try some spelling variations:
chung cong » nhung cong, chong cong, phung cong
hien xanh » hien hanh, hien nhanh, chieu xanh
qua chung » qua chuong, quat chung, cua chung
canh ban » can ban, canh van, doanh ban
canh dan » canh van, sanh dan, thanh dan
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
can van » cac van, can ban, tan 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 - ((((canh ban) OR (can van))) OR (canh dan)) qua chung cong dan toan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((((canh ban) or (can van))) or (canh dan)) qua chung cong dan toan ban*.