Perhaps you should try some spelling variations:
"dung tien tri snippets" » "duong tien tri snippets", "dung tren tri snippets", "dong tien tri snippets", "dung tieng tri snippets", "dung trien tri snippets", "dung kien tri snippets", "dung tien tri 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: (((("dung tien tri snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("dung tien tri snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.