Perhaps you should try some spelling variations:
"trinh toan khung snippets" » "tinh toan khung snippets", "thanh toan khung snippets", "trinh han khung snippets", "trinh toan chung snippets", "trinh toan khong snippets", "trinh toan thuong snippets", "trinh toan khung 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 toan khung 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 toan khung snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh toan khung snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.