Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
phan chung » phan cung, phan hung, phan thuong
chung cong » nhung cong, chong cong, phung cong
phan quang » pham quang, phan quan, nhanh quang
tung phan » trung phan, tuong phan, dung phan
cong phan » cong nhan, cong khan, chong phap
quang cao » nang cao, quang nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu tinh) or (chieu sang)) - thanh tung phan chung cong phan quang cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu tinh) OR (chieu sang)) - thanh tung phan chung cong phan quang cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu tinh) or (chieu sang)) - thanh tung phan chung cong phan quang cao*.