Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
cong toan » cong tan, cong hoan, cong tuan
toan phan » thanh phan, toan ban, hoa phan
phan dau » phan tu, 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) OR (canh tranh))) or (hanh chinh)) quan dung cong toan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - ((((hanh trinh) OR (canh tranh))) OR (hanh chinh)) quan dung cong toan phan dau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quang - ((((hanh trinh) OR (canh tranh))) or (hanh chinh)) quan dung cong toan phan dau*".