Perhaps you should try some spelling variations:
trong thanh » truong thanh, trung thanh, rong thanh
sang trong » lang trong, mang trong, nang trong
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
quang qua » quang cua, quang tuan, quang xuan
thanh van » thanh san, thanh toan, thanh phan
qua sang » qua song, qua san, bua sang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sach) or (hieu lang)) - tinh quang qua sang trong thanh van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (hieu lang)) - tinh quang qua sang trong thanh van ban*.