Perhaps you should try some spelling variations:
lang trong » dung trong, cong trong, dong trong
chieu sang » chieu sach, chieu xanh, nhieu tang
trong minh » truong minh, trong kinh, thong minh
hieu lang » hieu quang, nhieu tang, hieu van
quang qua » quang cua, quang tuan, quang xuan
minh toan » tinh toan, manh toan, minh tuan
qua lang » quan lang, cua lang, dua lang
toan ban » van ban

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