Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"com van cong snippets" » "com van dong snippets", "com van phong snippets", "com phan cong snippets", "tom van cong snippets", "gom van cong snippets", "nom van cong 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: (((("com van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("com van cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( com van cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("com van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.