Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dang doi trinh slippers" » "dang doc trinh slippers", "dang doi tinh slippers", "dang dong trinh slippers", "dung doi trinh slippers", "dang do trinh slippers", "dang noi trinh slippers", "dang doi trinh slippery", "dang doi trinh grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung java java snippets") or ("dang doi trinh slippers"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dang doi trinh slippers"))) or ("locating bug code snippets"))*.