Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
quang cua » quan cua, quang tuan, quang huy
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - nhanh quang cua dung cong ((dan than) OR (van than)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - nhanh quang cua dung cong ((dan than) OR (van than)) cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - nhanh quang cua dung cong ((dan than) OR (van than)) cao*.