Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa toan ve snippets" » "khoa than ve snippets", "hoa toan ve snippets", "khoa luan ve snippets", "khoa toan va snippets", "khoa toan ke snippets", "khoa toan von 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 toan ve 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 toan ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa toan ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa toan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.