Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
luan nhung » luan chung, luan hung, quan nhung
hieu lang » chieu sang, hieu quang, nhieu tang
tang luan » dung luan
anh tang » anh bang, anh dang, anh nang
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 lang - anh tang luan nhung cong trinh ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - anh tang luan nhung cong trinh ((toan tap) OR (toan ban))*".