Perhaps you should try some spelling variations:
"duong anh trac snippets" » "duong manh trac snippets", "duong xanh trac snippets", "duong vanh trac snippets", "duong sinh trac snippets", "duong anh tuan snippets", "duong anh thuc snippets", "duong anh trac slippers"
"using a code snippets" » "using a core snippets", "using a code slippers"
"locating bug code snippets" » "locating bug core 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: (((("using a code snippets") or ("duong anh trac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a code snippets") OR ("duong anh trac snippets"))) OR ("locating bug code snippets")).
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