Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"tang doi trong slippers" » "tang doi tuong slippers", "tang dot trong slippers", "tang dong trong slippers", "hang doi trong slippers", "tang loi trong slippers", "tang di trong slippers", "tang doi trong slippery", "tang doi trong 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 ("tang doi trong slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("tang doi trong slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( tang doi trong slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("tang doi trong slippers"))) or ("locating bug code snippets"))*.