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