Perhaps you should try some spelling variations:
trinh xay » trinh ky
dung lang » dung dang, dung nang, dung land
luong thi » luong tai
lang van » dang van, tang van, hoang van
van chat » cao chat
quan yen » quang yen, xuan yen, quan huyen
quan den » quan doan, quan he, quan doi
thi he » thi hue, thi hoe, thi ha

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