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