Perhaps you should try some spelling variations:
"nhung thu va snippets" » "hung thu va snippets", "nhung phu va snippets", "nhung chu va snippets", "nhung thuc va snippets", "nhung thue va snippets", "nhung tu va snippets", "nhung thu va 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: (((("nhung thu va snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhung thu va snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhung thu va snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhung thu va snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.