Perhaps you should try some spelling variations:
phuong luong » thuong luong, phuong duong, chuong duong
phuong dung » thong dung, cuong dung, phuong hoang
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
dong doan » dong doanh, cong doan, dong don
anh dong » anh huong, anh son
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 lang)) - anh dong doan ((phuong luong) OR (phuong dung)) tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - anh dong doan ((phuong luong) OR (phuong dung)) tinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu lang)) - anh dong doan ((phuong luong) OR (phuong dung)) tinh toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - anh dong doan ((phuong luong) OR (phuong dung)) tinh toan cau*.