Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"dung may doanh snippets" » "dung vay doanh snippets", "dung ly doanh snippets", "dung van doanh snippets", "dung va doanh snippets", "dung tai doanh snippets", "mang may doanh 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 ("dung may doanh snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("dung may doanh snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( dung may doanh snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("dung may doanh snippets"))) or ("locating bug core snippets"))*.