Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khi dai toc snippets" » "thi dai toc snippets", "khi bai toc snippets", "thoi dai toc snippets", "khi dan toc snippets", "khi dai hoc snippets", "khi dai luoc 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 dai toc 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 dai toc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khi dai toc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khi dai toc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.