Perhaps you should try some spelling variations:
"dung bo trong snippets" » "dung bo truong snippets", "dung bao trong snippets", "dung ro trong snippets", "dung co trong snippets", "dung mo trong snippets", "dung bo trong slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac code 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 bo trong snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung bo trong snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung bo trong snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.