Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trinh than rua snippets" » "trinh thanh rua snippets", "trinh han rua snippets", "trinh toan rua snippets", "trinh than cua snippets", "trinh than tuan snippets", "trinh thang cua 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 ("trinh than rua snippets"))) or ("locating bug core snippets"))~.
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