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
cong vang » cong lang, cong quang, cong ngang
cong van » cong san, song van, cong tan
toan ban » van ban
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 toan thong ((cong van) or (cong vang)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - hanh trinh toan thong ((cong van) OR (cong vang)) toan ban*.