Perhaps you should try some spelling variations:
thanh trung » thanh tung
khanh luong » khanh duong, khanh thuong, khanh phong
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung van » truong van, trong van, trung va
van khanh » van thanh, van hanh, van anh
luong va » dung va

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 manh) or (chieu sach)) - thanh trung van khanh luong va van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (chieu sach)) - thanh trung van khanh luong va van ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (chieu sach)) - thanh trung van khanh luong va van ban*.