Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khan van cau snippets" » "khanh van cau snippets", "phan van cau snippets", "nhan van cau snippets", "khan van dau snippets", "khan van hau snippets", "khan van chat 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: (((("khan van cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khan van cau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khan van cau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khan van cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.