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