Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nhap vai du snippets" » "nhap van du snippets", "nhan va du snippets", "nha van du snippets", "nhap va du snippets", "nhap tai du 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 vai du 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 vai du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhap vai du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhap vai du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.