Perhaps you should try some spelling variations:
"cong trinh luan van tai cong cua duong" » "cong trinh luat van tai cong cua duong", "cong trinh quan van tai cong cua duong", "cong trinh han van tai cong cua duong", "cong trinh luan van tai cong cua dong", "cong trinh luan van tai cong cua huong", "cong trinh luan van tai cong qua duong", "cong trinh luan van tai cong cu duong", "cong trinh luan van tai dong cua duong", "cong trinh luan van tai huong cua duong", "cong trinh luan von tai cong cua duong"
"cong trinh luan van tuan cong hai duong" » "cong trinh luat van tuan cong hai duong", "cong trinh quan van tuan cong hai duong", "cong trinh han van tuan cong hai duong", "cong trinh luan van thuan cong hai duong", "cong trinh luan van luan cong hai duong", "cong trinh luan van tran cong hai duong", "cong trinh luan van tuan cong dai cuong", "cong trinh luan van tuan cong hai phong", "cong trinh luan van quan cong hai duong", "cong trinh luan van ban cong hai duong", "cong trinh luan anh tuan cong hai duong", "cong trinh luan van tuan cong thai duong", "cong trinh luan van tuan cong ha duong", "cong trinh luan van tuan hoang hai duong"

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 tai cong cua duong") or ("cong trinh luan van tuan cong hai duong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong trinh luan van tai cong cua duong") OR ("cong trinh luan van tuan cong hai duong")).
• Removing quotes may allow a broader search: (( cong trinh luan van tai cong cua duong ) or ( cong trinh luan van tuan cong hai duong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van tai cong cua duong") or ("cong trinh luan van tuan cong hai duong"))*.