Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
cong thanh » dong thanh, cong trinh, cong tan
thanh phan » thanh pho, thanh san, thanh toan
trinh cua » tinh cua, trinh quan, trinh luan
dung cong » dung trong
phan cau » phan dau, phan cac, phan tu
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu quang - hanh ((trinh cua) OR (trinh luat)) dung cong thanh phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quang - hanh ((trinh cua) OR (trinh luat)) dung cong thanh phan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - hanh ((trinh cua) OR (trinh luat)) dung cong thanh phan cau*.