Perhaps you should try some spelling variations:
"thong dung code snippets" » "thong cong code snippets", "thong thuong code snippets", "thong dung cong snippets", "thong dung co snippets", "thong dung de snippets", "thong dung code slippers"
"dang hung java snippets" » "dang quang java snippets", "manh hung java snippets", "dang cong java snippets", "dang hung 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: (((("dang hung java snippets") or ("thong dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang hung java snippets") OR ("thong dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang hung java snippets ) or ( thong dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang hung java snippets") or ("thong dung code snippets"))) or ("locating bug code snippets"))*.