Perhaps you should try some spelling variations:
"hoa luan tot nghien." » "hoa luan mot nghien." (Expand Search), "hoa luan tat nghien." (Expand Search), "hoa luan noi nghien." (Expand Search), "hoa quan tot nghien." (Expand Search), "hoa lang tot nghien." (Expand Search)
"khoa luan tot nghien." » "khoa luan mot nghien." (Expand Search), "khoa luan tat nghien." (Expand Search), "khoa luan noi nghien." (Expand Search), "khoa quan tot nghien." (Expand Search), "khoa lang tot nghien." (Expand Search)
"hoa luan tot nghiep." » "hoa quan tot nghiep." (Expand Search), "hoa lang tot nghiep." (Expand Search)

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: (("hoa luan tot nghiep.") OR ((("hoa luan tot nghien.") OR ("khoa luan tot nghien."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"hoa luan tot nghiep.\") OR (((\"hoa luan tot nghien.\") OR (\"khoa luan tot nghien.\"))))".
• Removing quotes may allow a broader search: (( hoa luan tot nghiep. ) OR ((( hoa luan tot nghien. ) OR ( khoa luan tot nghien. )))).
• Adding a wildcard symbol may retrieve word variants: (("hoa luan tot nghiep.") OR ((("hoa luan tot nghien.") OR ("khoa luan tot nghien."))))*.