Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
hanh tang » hanh trang, hanh mang, hanh tung
hua thong » hoa thong, hua khong, huu thong
anh tang » anh bang, anh dang, anh nang
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu xanh) or (chieu sach)) - ((hanh tang) or (anh tang)) hua thong cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu xanh) OR (chieu sach)) - ((hanh tang) OR (anh tang)) hua thong cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu xanh) or (chieu sach)) - ((hanh tang) or (anh tang)) hua thong cong dan van ban*.