Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
dung cong » dung trong
khoan cam » khoa cam, khoan va, phan cam
theo chu » theo chieu, cho chu, chao chu
chu sang » chu bang, thu sang, chieu sang
manh cua » doanh cua
than cau » toan cau, phan cau, than cap
ban cua » ban quan

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sang - canh ((manh cua) OR (ban cua)) dung cong thanh ((than cau) OR (khoan cam))~".
• Adding a wildcard symbol may retrieve word variants: theo chu sang - canh ((manh cua) OR (ban cua)) dung cong thanh ((than cau) OR (khoan cam))*.