Perhaps you should try some spelling variations:
"trinh tuan thu snippets" » "trinh quan thu snippets", "trinh toan thu snippets", "trinh luan thu snippets", "trinh toan thuc snippets", "trinh van thu snippets", "trinh tuan thu 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: (((("trinh tuan thu snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh tuan thu snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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