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

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 sang) or (hieu lang)) - tinh quang qua mang trong thanh van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (hieu lang)) - tinh quang qua mang trong thanh van ban*.