Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
cong vang » cong lang, cong quang, cong ngang
chinh can » chinh ca, chinh ban, chinh cau
trinh su » trinh tu, trinh san, trinh cau
cong van » cong san, song van, cong tan
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 lang - hanh trinh su dung ((cong van) OR (cong vang)) chinh can~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh trinh su dung ((cong van) OR (cong vang)) chinh can".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trinh su dung ((cong van) OR (cong vang)) chinh can*.