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