Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"len trinh luan snippets" » "len trinh luat snippets", "len trinh quan snippets", "len trinh han snippets", "len tinh luan snippets", "tien trinh luan snippets", "lap trinh luan 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 ("len trinh luan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("len trinh luan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( len trinh luan snippets ))) or ( locating bug core snippets )).
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