Perhaps you should try some spelling variations:
luong thiet » luong thien, luong thit, tuong thiet
luong tiet » luong viet, luong tien, luong thien
trinh xay » trinh ky
khe quang » che quang, nghe quang, le quang
van chat » cao chat
ke quang » le quang, ke quan, de quang
luan » quan, lan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: cong trinh xay dung luan van chat ((luong thiet) or (luong tiet)) ((ke quang) OR (khe quang)) yen~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cong trinh xay dung luan van chat ((luong thiet) OR (luong tiet)) ((ke quang) OR (khe quang)) yen.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cong trinh xay dung luan van chat ((luong thiet) or (luong tiet)) ((ke quang) OR (khe quang)) yen".
• Adding a wildcard symbol may retrieve word variants: cong trinh xay dung luan van chat ((luong thiet) or (luong tiet)) ((ke quang) OR (khe quang)) yen*.