Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets", "using java code slippers"
"manh cuong tan snippets" » "anh huong tan snippets", "manh hung tan snippets", "tang cuong tan snippets", "manh cong tan snippets", "manh cung tan snippets", "manh cuong tap snippets", "manh cuong tan 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 java code snippets") or ("manh cuong tan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("manh cuong tan snippets"))) OR ("locating bug code snippets")).
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