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