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