Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan trong » gian trong
cong tan » cong tac, cong san, cong thanh
phan dau » hang dau
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 quan trong cong tan ((phan dau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - hanh trinh quan trong cong tan ((phan dau) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - hanh trinh quan trong cong tan ((phan dau) or (phan tu))*.