Perhaps you should try some spelling variations:
trinh xay » trinh ky
dung dang » dung dan, dung dong, dung danh
luong thi » luong tai
dang van » hoang van, hang va
van chat » cao chat
quan yen » quang yen, quan den, quan huyen
xuan yen » xuan tuyen, quang yen, xuan dien
thi ke » thi le, thi kiem, thi kieu

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 dang van chat luong thi ke ((quan yen) OR (xuan yen))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cong trinh xay dung dang van chat luong thi ke ((quan yen) OR (xuan yen))*".