Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa than do snippets" » "khoa luan do snippets", "hoa thai do snippets", "hoa tan do snippets", "khoa than doc snippets", "khoa thanh do snippets", "khoa than vo 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 than 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 than do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa than do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa than do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.