Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trong cao sach snippets" » "truong cao sach snippets", "trong cac sach snippets", "trong ca sach snippets", "trong co sach snippets", "trong ao sach snippets", "trong cau sach 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 ("trong cao sach snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("trong cao sach snippets"))) OR ("locating bug core snippets")).
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