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