Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"data van du snippets" » "data phan du snippets", "dang van du snippets", "dao van du snippets", "data van duy snippets", "data van dau snippets", "data van de 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: (((("data van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("data van du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( data van du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("data van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.