Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, nhung don
hieu lang » chieu sang, nhieu tang, hieu van
hang cong » dang cong, hang nong, bang cong
van tai » von tai, van tuan
tai cau » tai cac, tai cao

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 quan ((nhung cong) OR (hang cong)) van tai cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - hanh trinh quan ((nhung cong) or (hang cong)) van tai cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - hanh trinh quan ((nhung cong) or (hang cong)) van tai cau*.