Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
trang va » tran van, hang va
cong van » cong vang, cong san, song van

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: nho ((hieu lang) OR (hieu quang)) - hanh trang va nhung cong van ((toan ban) OR (van ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu lang) OR (hieu quang)) - hanh trang va nhung cong van ((toan ban) or (van ban))~".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu lang) OR (hieu quang)) - hanh trang va nhung cong van ((toan ban) or (van ban))*.