Perhaps you should try some spelling variations:
phuong trinh » chuong trinh, cong trinh, huong tran
dong phuong » duong phuong, dung phuong, dong huong
hieu quang » thieu quang, hieu quan, hieu qua
hanh trang » thanh trung, canh tranh, hanh trinh
hieu sang » chieu sang, hieu lang, nhieu tang
trang cua » tranh cua, tang cua, trung cua
cua dong » chua dong, cua cong, cua dang
hang ban » hang luan, hang va, hang tai
han ban » van ban, can ban, han san

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 (hieu quang)) - hanh trang cua dong phuong trinh ((han ban) OR (hang ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu quang)) - hanh trang cua dong phuong trinh ((han ban) OR (hang ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) or (hieu quang)) - hanh trang cua dong phuong trinh ((han ban) OR (hang ban))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu quang)) - hanh trang cua dong phuong trinh ((han ban) OR (hang ban))*.