Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dan van cau snippets" » "dang van cau snippets", "doan van cau snippets", "dao van cau snippets", "dan van dau snippets", "dan van hau snippets", "dan 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: (((("dan 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: (((("dan van cau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan van cau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan van cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.