Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"truan doc phan snippets" » "truan doi phan snippets", "than doc phan snippets", "quan doc phan snippets", "truan hoc phan snippets", "truan duc phan snippets", "truan doc than snippets"
"locating bug core snippets" » "locating bug 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 ("truan doc phan snippets"))) or ("locating bug core snippets"))~.
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