Perhaps you should try some spelling variations:
vien nganh » vien thanh
hieu xanh » chieu xanh, hieu manh, hieu nganh
trang qua » trong quan, trang tuan, trung quan
trong qua » trong quan, thong qua, trong nha
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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) or (vien nganh)) - hanh ((trang qua) or (trong qua)) dung cong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (vien nganh)) - hanh ((trang qua) OR (trong qua)) dung cong dan than ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (vien nganh)) - hanh ((trang qua) or (trong qua)) dung cong dan than ban*.