Perhaps you should try some spelling variations:
trinh quang » tinh quang, tranh quang, trinh dung
chieu sach » chinh sach, chieu sang, chieu xanh
trinh quan » tinh quang, trinh luat, trinh han
ban thanh » ban hanh, ban hang
thanh ban » thanh san, thanh van, thanh bac
ban cong » bang cong, van cong, phan cong
cong ban » cong bang, cong san, cong tan

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) OR (chiet tach)) - hanh ((trinh quang) or (trinh quan)) ban cong ban thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chiet tach)) - hanh ((trinh quang) OR (trinh quan)) ban cong ban thanh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (chiet tach)) - hanh ((trinh quang) or (trinh quan)) ban cong ban thanh ban".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (chiet tach)) - hanh ((trinh quang) or (trinh quan)) ban cong ban thanh ban*.