Perhaps you should try some spelling variations:
phuong trong » thuong trong, huong trong, phong trong
toan phuong » doan phuong, tran phuong, toan thuong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
trong sinh » trong kinh, trong san
dang toan » dang tran, dan toan, dung toan
sinh toan » tinh toan, hinh toan, minh toan
anh dang » anh dong, anh dung, anh bang
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (hieu quang)) - anh dang toan phuong trong sinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu quang)) - anh dang toan phuong trong sinh toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu quang)) - anh dang toan phuong trong sinh toan cau*.