Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
thanh phan » thanh pho, thanh san, thanh toan
tuan tong » thuan trong, toan thong, tuan duong
toan tong » toan thong, toan trong, toan cong
thanh hai » thanh hoa, thanh san
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - thanh trung ((tuan tong) OR (toan tong)) cong tan ((thanh hai) or (thanh phan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh trung ((tuan tong) OR (toan tong)) cong tan ((thanh hai) OR (thanh phan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh trung ((tuan tong) OR (toan tong)) cong tan ((thanh hai) or (thanh phan))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh trung ((tuan tong) OR (toan tong)) cong tan ((thanh hai) or (thanh phan))*.