Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
dien sach » dien anh
trung cap » truong cao, trung tam
dang cong » dung cong
hang nong » thang long, han tong
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((dien sach) or (chieu sach)) - thanh trung cap ((dang cong) or (hang nong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((dien sach) OR (chieu sach)) - thanh trung cap ((dang cong) OR (hang nong)) tac toan cau.
• Adding a wildcard symbol may retrieve word variants: doc ((dien sach) or (chieu sach)) - thanh trung cap ((dang cong) or (hang nong)) tac toan cau*.