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