Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"phan ve lua slippers" » "phan le lua slippers", "phan va lua slippers", "pha ve lua slippers", "phan ve luat slippers", "phan ve mua slippers", "phan ve cua slippers", "phan ve lua slippery", "phan ve lua grippers"
"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 ("phan ve lua slippers"))) or ("locating bug code snippets"))~.
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