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