Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu sang » chieu sach, chieu xanh, nhieu tang
phuong tac » phuong tay, phuong bac, huong tac
hieu lang » hieu quang, nhieu tang, hieu van
tuong va » truong va, thuong va, luong va
tac doan » tap doan, tan doan, thai doan
doan tap » toan tap, doan cap, doanh tai

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)) - thanh tuong va nhung phuong tac doan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (hieu lang)) - thanh tuong va nhung phuong tac doan tap.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (hieu lang)) - thanh tuong va nhung phuong tac doan tap*.