Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"trung hieu hoc snippets" » "thuong hieu hoc snippets", "trung kien hoc snippets", "trong hiep hoc snippets", "trung lieu hoc snippets", "trung hieu hoa snippets", "trung tieu hoc snippets"
"locating bug code snippets" » "locating bug core 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 snippets") or ("trung hieu hoc snippets"))) or ("locating bug code snippets"))~.
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