Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
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 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 ((hieu sang) or (chieu sang)) - canh tranh va nhung phuong hinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (chieu sang)) - canh tranh va nhung phuong hinh toan ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (chieu sang)) - canh tranh va nhung phuong hinh toan ban*.