Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"duc cac thoi snippets" » "duc cac toi snippets", "duc cac hop snippets", "duc cac tro snippets", "duoc cac thoi snippets", "tuc cac thoi snippets", "muc cac thoi 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 ("duc cac thoi snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("duc cac thoi snippets"))) OR ("locating bug code snippets")).
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