Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"trong san pha slippers" » "trong cac pha slippers", "cong san pha slippers", "dong san pha slippers", "trong san pham slippers", "trong san phan slippers", "trong san phu slippers", "trong san pha slippery", "trong san pha 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 ("trong san pha slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("trong san pha slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trong san pha slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trong san pha slippers"))) or ("locating bug code snippets"))*.