Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets", "using java code slippers"
"pham toan trac snippets" » "pham tuan trac snippets", "pham tan trac snippets", "phap toan trac snippets", "pham toan tran snippets", "pham thoan tran snippets", "pham toan tap snippets", "pham toan trac slippers"
"locating bug code snippets" » "locating bug core snippets", "locating bug code slippers", "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 ("pham toan trac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("pham toan trac snippets"))) OR ("locating bug code snippets")).
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