Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tieu sach » dien sach, te sach, viet sach
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
cong van » cong vang, cong san, song van
van phan » van phong, van thanh, luan phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((tieu sach) OR (chieu sach)) - canh ((trinh va) or (hang va)) dung cong van phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu sach) OR (chieu sach)) - canh ((trinh va) OR (hang va)) dung cong van phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sach) OR (chieu sach)) - canh ((trinh va) or (hang va)) dung cong van phan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu sach) OR (chieu sach)) - canh ((trinh va) or (hang va)) dung cong van phan cau*.