Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
cong nang » cong ngang, cong lang, cong nong
nang phan » nang phat, nang thanh, nang quan
tam tong » tam nong, tam song, tam thuong
tai tong » tai trong, tai cong, tai truong
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 ((tam tong) OR (tai tong)) cong nang phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chinh sach) OR (chiet tach)) - thanh trung ((tam tong) OR (tai tong)) cong nang phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chinh sach) or (chiet tach)) - thanh trung ((tam tong) OR (tai tong)) cong nang phan dau".
• Adding a wildcard symbol may retrieve word variants: theo ((chinh sach) or (chiet tach)) - thanh trung ((tam tong) OR (tai tong)) cong nang phan dau*.