Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"che quoc son snippets" » "che duoc son snippets", "he quoc son snippets", "che thuoc son snippets", "che cuoc song snippets", "che nuoc song snippets", "che quoc 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: (((("che quoc son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("che quoc son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( che quoc son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("che quoc son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.