Perhaps you should try some spelling variations:
"cong trinh luan van thi cong cua duong" » "cong trinh luat van thi cong cua duong", "cong trinh quan van thi cong cua duong", "cong trinh han van thi cong cua duong", "cong trinh luan van thi cong cua dong", "cong trinh luan van thi cong cua huong", "cong trinh luan van thi cong qua duong", "cong trinh luan van tai cong cua duong", "cong trinh luan van thi cong cu duong", "cong trinh luan van thi dong cua duong", "cong trinh luan van thi huong cua duong", "cong trinh luan dan thi cong cua duong", "cong trinh luan van thu cong cua duong"
"cong trinh luan van thien cong cua duong" » "cong trinh luat van thien cong cua duong", "cong trinh quan van thien cong cua duong", "cong trinh han van thien cong cua duong", "cong trinh luan van thien cong cua dong", "cong trinh luan van thien cong cua huong", "cong trinh luan van thien cong qua duong", "cong trinh luan van tien cong cua duong", "cong trinh luan van hien cong cua duong", "cong trinh luan van chien cong cua duong", "cong trinh luan van thien cong cu duong", "cong trinh luan van thien dong cua duong", "cong trinh luan van thien huong cua duong", "cong trinh luan van taien cong cua duong", "cong trinh luan dan thien cong cua duong", "cong trinh luan van thuen cong cua 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 thi cong cua duong") OR ("cong trinh luan van thien cong cua duong"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cong trinh luan van thi cong cua duong\") OR (\"cong trinh luan van thien cong cua duong\"))".
• Removing quotes may allow a broader search: (( cong trinh luan van thi cong cua duong ) OR ( cong trinh luan van thien cong cua duong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van thi cong cua duong") OR ("cong trinh luan van thien cong cua duong"))*.