Perhaps you should try some spelling variations:
"cong trinh luat van thi cong nhat thuong" » "cong trinh xuat van thi cong nhat thuong", "cong trinh luat van thi cong nhan thuong", "cong trinh luat van thi cong nhat truong", "cong trinh luat van thi cong nhat huong", "cong trinh luat van thi cong nhat thong"
"cong trinh luan van thi cong san luong" » "cong trinh quan van thi cong san luong", "cong trinh lan van thi cong san luong"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong trinh luat van thi cong nhat thuong") OR ("cong trinh luan van thi cong san luong"))~.
• Removing quotes may allow a broader search: (( cong trinh luat van thi cong nhat thuong ) or ( cong trinh luan van thi cong san luong ))~.
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luat van thi cong nhat thuong") or ("cong trinh luan van thi cong san luong"))*.