Perhaps you should try some spelling variations:
"using java code slippers" » "using data code slippers"
"lua cac nhat snippets" » "lua cac nha snippets", "lua cac nhan snippets", "lua cac chat snippets", "luat cac nhat snippets", "cua cac nhat snippets", "qua cac nhat snippets"
"locating bug code snippets" » "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 java code slippers") or ("lua cac nhat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code slippers") OR ("lua cac nhat snippets"))) OR ("locating bug code snippets")).
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