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