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