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