Perhaps you should try some spelling variations:
"cong trinh luan van thi cong chan thuong" » "cong trinh luan van thi cong phan thuong", "cong trinh luan van thi cong han thuong", "cong trinh luan van thi cong hang thuong", "cong trinh luat van thi cong chan thuong", "cong trinh quan van thi cong chan thuong", "cong trinh toan van thi cong chan thuong", "cong trinh luan van thi cong nhan thuong", "cong trinh luan van thi cong khan thuong", "cong trinh luan van tai cong chan thuong", "cong trinh luan van thien cong chan thuong", "cong trinh luan dan thi cong chan thuong", "cong trinh luan van thu cong chan thuong"
"cong trinh han van thi cong chat huong" » "cong trinh han van thi cong chat luong", "cong trinh han van thi cong nhat huong", "cong trinh han van thi cong chap thuong", "cong trinh quan van thi cong chat huong", "cong trinh han van thi cong cua huong", "cong trinh han van thi cong ha huong", "cong trinh han van tai cong chat huong", "cong trinh han van thien cong chat huong", "cong trinh han dan thi cong chat huong", "cong trinh han van thu cong chat huong", "cong trinh phan van thi cong chat huong", "cong trinh nhan van thi cong chat huong", "cong trinh hanh van thi cong chat huong"

Try widening your search to All Fields.

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