Perhaps you should try some spelling variations:
"trinh anh dung snippets" » "trinh hanh dung snippets", "trinh thanh dung snippets", "trinh kinh dung snippets", "trinh anh dong snippets", "trinh anh huong snippets", "trinh sach dung snippets", "trinh anh dung slippers"
"dung cho code snippets" » "dung cho cong snippets", "dung cfd code snippets", "dung cho con snippets", "dung cho 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 anh dung snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh anh dung snippets") OR ("dung cho code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh anh dung snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))*.