Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"danh van du snippets" » "doanh van du snippets", "dang van du snippets", "dinh van du snippets", "danh van duy snippets", "danh van dau snippets", "danh 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: (((("danh 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: (((("danh van du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh van du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.