Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tham nhap so snippets" » "tham khao so snippets", "thu nhap so snippets", "pham nhat so snippets", "tham nhat so snippets", "tham phap so snippets", "tham nha so 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: (((("tham nhap 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: (((("tham nhap so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tham nhap so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tham nhap so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.