Perhaps you should try some spelling variations:
"trinh hanh dung snippets" » "trinh thanh dung snippets", "trinh han dung snippets", "trinh anh dung snippets", "trinh hanh dong snippets"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh hanh dung snippets") or ("dung dung code snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh hanh dung snippets") OR ("dung dung code snippets"))) OR ("locating bug code slippers")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh hanh dung snippets") or ("dung dung code snippets"))) or ("locating bug code slippers"))*.