Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
phuong hinh » phuong binh, phuong linh, phuong dinh
chieu sang » chieu sach, chieu xanh, hieu lang
hieu sang » hieu lang, hieu quang, nhieu tang
hinh toan » tinh toan, thanh toan, trinh toan
tranh va » tranh van, trang va, trinh va
toan tap » toan ban
va dung » van dung, va duong, vat dung

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 sang) or (chieu sang)) - canh tranh va dung phuong hinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (chieu sang)) - canh tranh va dung phuong hinh toan tap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (chieu sang)) - canh tranh va dung phuong hinh toan tap*.