Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vat khoa noi snippets" » "da khoa noi snippets", "tai khoa noi snippets", "vat hoc noi snippets", "vat khoa doi snippets", "vat khoa hoi snippets", "vat khoan nhoi 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: (((("vat khoa noi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vat khoa noi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vat khoa noi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vat khoa noi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.