Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"moi juan cao snippets" » "moi quan cao snippets", "moi xuan cao snippets", "hoi luan cao snippets", "moi quang cao snippets", "moi toan cao snippets", "moi quan cau snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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: (((("moi juan cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("moi juan cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( moi juan cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("moi juan cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.