Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
trinh quan » trinh luat, trinh han
phan cong » thanh cong
cong tac » cong ty
tran cau » tran chau, toan cau, tra cau
ho hieu » ho chieu, hoi hieu, nho hieu
ran cau » van cau, ban cau, can cau

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 quan) OR (tinh quang)) phan cong tac ((tran cau) or (ran cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - hanh ((trinh quan) OR (tinh quang)) phan cong tac ((tran cau) OR (ran cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quang - hanh ((trinh quan) OR (tinh quang)) phan cong tac ((tran cau) or (ran cau))".
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - hanh ((trinh quan) OR (tinh quang)) phan cong tac ((tran cau) or (ran cau))*.