Perhaps you should try some spelling variations:
chuong duong » cuong duong, tuong duong, cuong dung
phuong cong » phuong dong, phong cong, phung cong
hieu quang » thieu quang, hieu quan, hieu qua
canh trinh » canh tranh, hanh trinh, canh tinh
nho hieu » nha hieu, nho sieu, nhu hieu
trinh va » trinh van, trinh vat, trinh ve
anh luan » anh tuan, anh quan, anh xuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho hieu quang - canh trinh va ((phuong cong) or (chuong duong)) anh luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu quang - canh trinh va ((phuong cong) OR (chuong duong)) anh luan van.
• Adding a wildcard symbol may retrieve word variants: nho hieu quang - canh trinh va ((phuong cong) or (chuong duong)) anh luan van*.