Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh sang » thanh san, thanh hang, thanh hoang
sang trong » lang trong, mang trong, nang trong
hieu lang » hieu quang, nhieu tang, hieu van
trong dan » trong dang, trong san, trong tan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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

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