Perhaps you should try some spelling variations:
truong trung » tieng trung
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh
hieu lang » chieu sang, hieu quang, nhieu tang
dan khan » dan khanh, dan chan, dan than
ho hieu » ho chieu, hoi hieu, nho hieu
khan ap » khan cap, han ap, khan dam

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) OR (hanh chinh)) cua ((nhung cong) or (truong trung)) dan khan ap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((hanh trinh) OR (hanh chinh)) cua ((nhung cong) OR (truong trung)) dan khan ap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((hanh trinh) OR (hanh chinh)) cua ((nhung cong) or (truong trung)) dan khan ap".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh trinh) OR (hanh chinh)) cua ((nhung cong) or (truong trung)) dan khan ap*.