Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nhap van so snippets" » "nha van so snippets", "nhan van so snippets", "phap van so snippets", "nhap van son snippets", "nhap van soa snippets", "nhap van su 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: (((("nhap van so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhap van so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhap van so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhap van so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.