Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets", "using java code slippers"
"trinh thi tren snippets" » "trinh tai tren snippets", "trinh thiet tren snippets", "trinh tu tren snippets", "trinh thai tren snippets", "trinh thi tran snippets", "trinh thi trang snippets", "trinh thi tren slippers"
"locating bug code snippets" » "locating bug core snippets", "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("trinh thi tren snippets"))) OR ("locating bug code snippets")).
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