Perhaps you should try some spelling variations:
"nhung gian dac snippets" » "nhung gia dac snippets", "nhung giai dac snippets", "khong gian dac snippets", "nhung gian dan snippets", "nhung gian cac snippets", "nhung giang day snippets", "nhung gian dac 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 gian dac 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 gian dac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhung gian dac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhung gian dac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.