Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"den cong tan slippers" » "dien cong tan slippers", "den dong tan slippers", "len cong tan slippers", "den cong tac slippers", "den cong san slippers", "den cong thanh slippers", "den cong tan slippery", "den cong tan grippers"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs 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 ("den cong tan slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("den cong tan slippers"))) OR ("locating bug code snippets")).
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