Perhaps you should try some spelling variations:
luong thiet » luong thien, luong thit, luong tiet
tran van » luan van
thiet he » thiet ke, thien he, thiet de
quan den » quan doan, quan he, quan doi
ky dang » ky nang, ky danh
tan van » tang van, luan van, dang van
he quan » che quan, ve quan, te quan

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 ky dang ((tan van) OR (tran van)) chat luong thiet he quan den~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cong trinh ky dang ((tan van) OR (tran van)) chat luong thiet he quan den*".