Perhaps you should try some spelling variations:
"ninh doi trinh snippets" » "ninh doc trinh snippets", "ninh doi tinh snippets", "ninh dong trinh snippets", "tinh doi trinh snippets", "trinh doi trinh snippets", "ninh duc trinh snippets", "ninh doi trinh slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("ninh doi trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ninh doi trinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ninh doi trinh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ninh doi trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.