Perhaps you should try some spelling variations:
"dung cong code snippets" » "dung trong code snippets", "dung cong cong snippets", "dung cong co snippets", "dung cong che snippets", "dung cong code slippers"
"nham ung java snippets" » "nhan ung java snippets", "nham nang java snippets", "kham xung java snippets", "nham using java snippets", "nham ngu java snippets", "nham ung va snippets", "nham ung java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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