Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
trung quan » truong quan, trong quan, trung tuan
nhung cong » dung cong, thong cong, nhung don
hang cong » dang cong, hang nong, bang cong
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chinh sach) or (chiet tach)) - thanh trung quan ((nhung cong) OR (hang cong)) dan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chinh sach) OR (chiet tach)) - thanh trung quan ((nhung cong) OR (hang cong)) dan phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chinh sach) or (chiet tach)) - thanh trung quan ((nhung cong) OR (hang cong)) dan phan dau".
• Adding a wildcard symbol may retrieve word variants: theo ((chinh sach) or (chiet tach)) - thanh trung quan ((nhung cong) OR (hang cong)) dan phan dau*.