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