Perhaps you should try some spelling variations:
thieu quang » thien quan, trien quang, hieu quan
hieu quang » hieu quan, hieu qua, diep quang
nhung cong » dung cong, thong cong, hang cong
hanh tich » hanh thich, thanh tich, hanh tinh
doan phan » doanh phan, toan phan, dan 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: hoc ((thieu quang) OR (hieu quang)) - hanh tich va ((nhung cong) or (dung trong)) doan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (hieu quang)) - hanh tich va ((nhung cong) OR (dung trong)) doan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu quang) OR (hieu quang)) - hanh tich va ((nhung cong) or (dung trong)) doan phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quang) OR (hieu quang)) - hanh tich va ((nhung cong) or (dung trong)) doan phan cau*.