Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phan van lon snippets" » "pham van lon snippets", "thanh van lon snippets", "luan van lon snippets", "phan van long snippets", "phan van loi snippets", "phan van loc 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 lon 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 lon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan van lon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan van lon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.