Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khi toan von snippets" » "chi toan von snippets", "ke toan von snippets", "bai toan von snippets", "khi toan ban snippets", "khi toan hoc snippets", "khi toan ho 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: (((("khi toan von snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khi toan von snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khi toan von snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khi toan von snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.