Perhaps you should try some spelling variations:
luong thiet » luong thien, luong thit, tuong thiet
luong tiet » luong viet, luong tien, luong thien
dang luan » dung luan, tang luan, hang luan
quang yen » quan den
van chat » cao chat
ky dang » ky nang, ky danh
hung » huong, nhung, chung

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