Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"dung soi quang snippets" » "dung hoi quang snippets", "dung noi quang snippets", "dung son quang snippets", "dung sai quang snippets", "dung doi quang snippets", "dung so quang snippets"
"locating bug code 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 core snippets") or ("dung soi quang snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("dung soi quang snippets"))) OR ("locating bug code snippets")).
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