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