Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » chieu sang, nhieu tang, hieu van
nang cong » nang song, dang cong, hang cong
bang cong » dang cong, bang song, hang cong
van toan » van tuan, van tan, van thanh
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - hanh trinh toan ((nang cong) OR (bang cong)) van toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - hanh trinh toan ((nang cong) or (bang cong)) van toan ban~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - hanh trinh toan ((nang cong) or (bang cong)) van toan ban*.