Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa he doan snippets" » "hoa he doan snippets", "khoa hoc doan snippets", "khong he doan snippets", "khoa he dan snippets", "khoa le doan snippets", "khoa thi doan 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 he doan 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 he doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa he doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa he doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.