Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
va phuong » va thuong, cac phuong
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh nang, anh sang
anh dang » anh dong, anh dung, anh bang
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 - ((anh tang) or (anh dang)) va phuong cong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((anh tang) OR (anh dang)) va phuong cong dan than ban*.