Perhaps you should try some spelling variations:
quang quang » quan quang, dang quang, dung quang
thieu lang » thieu khang, thieu quang, chieu sang
quang dung » quang trung, ung dung, cuong dung
hieu lang » chieu sang, hieu quang, nhieu tang
van thanh » ban thanh, van tuan
van toan » van tuan, van tan, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu lang) OR (hieu lang)) - tinh quang quang dung trong ((van toan) or (van thanh)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu lang) OR (hieu lang)) - tinh quang quang dung trong ((van toan) OR (van thanh)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu lang) OR (hieu lang)) - tinh quang quang dung trong ((van toan) or (van thanh)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu lang) OR (hieu lang)) - tinh quang quang dung trong ((van toan) or (van thanh)) ban*.