Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"chung hoc trinh slippers" » "trung hoc trinh slippers", "dung hoc trinh slippers", "hung hoa trinh slippers", "chung doc trinh slippers", "chung hoc tinh slippers", "chung hoc sinh slippers", "chung hoc trinh slippery", "chung hoc 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 ("chung hoc trinh slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("chung hoc trinh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( chung hoc trinh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("chung hoc trinh slippers"))) or ("locating bug code snippets"))*.