Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu lang » chieu sang, hieu quang, nhieu tang
quang van » quang ban, quan van, quang uan
trong dan » trong dang, trong san, trong tan
van dung » van dong, xay dung, tin dung
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 tinh)) - tinh quang van dung trong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu lang) OR (chieu tinh)) - tinh quang van dung trong dan than ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) or (chieu tinh)) - tinh quang van dung trong dan than ban*.