Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham nhan du snippets" » "pham nhat du snippets", "ham nhan du snippets", "pham thanh du snippets", "pham nhan su snippets", "pham han du snippets", "pham nhan xu 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: (((("pham nhan 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: (((("pham nhan du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham nhan du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham nhan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.