Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
trinh toan » tinh toan, thanh toan, trinh han
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
hinh toan » tinh toan, thanh toan, manh toan

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