Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khu doan ve snippets" » "kieu doan ve snippets", "khu do ve snippets", "thi doan ve snippets", "khu doan va snippets", "khu doan vi snippets", "khu toan ve 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: (((("khu doan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khu doan ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khu doan ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khu doan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.