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