Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
trinh cua » tinh cua, trinh quan, trinh luan
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
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 tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - hanh ((trinh cua) OR (trinh luat)) dung cong tan phan cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - hanh ((trinh cua) or (trinh luat)) dung cong tan phan cau*.