Perhaps you should try some spelling variations:
"khang benh trac snippets" » "kham benh trac snippets", "khang sinh trac snippets", "phong benh trac snippets", "khang benh truoc snippets", "khang benh tai snippets", "khang anh trac snippets", "khang benh trac slippers"
"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", "dung dung 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 dung code snippets") or ("khang benh trac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dung code snippets") OR ("khang benh trac snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung dung code snippets") or ("khang benh trac snippets"))) or ("locating bug code snippets"))*.