Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"dung viet ky snippets" » "nang viet ky snippets", "cong viet ky snippets", "mang viet ky snippets", "dung viet my snippets", "dung viet ty snippets", "dung viet duy 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: (((("using java code snippets") or ("dung viet ky snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("dung viet ky snippets"))) OR ("locating bug code slippers")).
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