Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoi con so snippets" » "khi con so snippets", "khoe con so snippets", "khoi can so snippets", "khoi cong so snippets", "khoi hon so snippets", "khoi 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: (((("khoi 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: (((("khoi con so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoi con so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoi con so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.