Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung cuu hanh slippers" » "dung cua hanh slippers", "dung cu hanh slippers", "dung cau hanh slippers", "dung cuu thanh slippers", "dung luu hanh slippers", "dung cuu anh slippers", "dung cuu hanh slippery", "dung cuu hanh 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 cuu hanh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cuu hanh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cuu hanh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cuu hanh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.