Perhaps you should try some spelling variations:
"dung nhung code snippets" » "dung chung code snippets", "dung nhan code snippets", "dung trung code snippets", "dung nhung cong snippets", "dung nhung con snippets", "dung nhung code slippers"
"tran dbug code snippets" » "tran duc code snippets", "tran dang code snippets", "tran dung code snippets", "tran dbug code slippers", "tran dbung code snippets", "tran dbugs code snippets"
"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 nhung code snippets") or ("tran dbug code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung nhung code snippets") OR ("tran dbug code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung nhung code snippets") or ("tran dbug code snippets"))) or ("locating bug code snippets"))*.