Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa con so snippets" » "khoa cong so snippets", "khoa can so snippets", "khoa co so snippets", "khoa hon so snippets", "khoa con bo 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: (((("khoa con so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa con so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa con so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa con so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.