Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thanh tung » thanh cong
trong sat » trong san, trong dat, trong sam
doc hieu » toc thieu, hoc thieu, hoc hien
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
sat phan » sat nhan, vat phan, xuat phan
phan cau » phan dau, phan cac, phan tu

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 quang - thanh tung cua dung trong sat phan cau~.
• Adding a wildcard symbol may retrieve word variants: doc hieu quang - thanh tung cua dung trong sat phan cau*.