Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"hanh san trinh slippers" » "hanh dan trinh slippers", "hanh san tinh slippers", "hanh van trinh slippers", "thanh san trinh slippers", "khach san trinh slippers", "thanh son trinh slippers", "hanh san trinh slippery", "hanh san 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 ("hanh san 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 ("hanh san trinh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( hanh san trinh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("hanh san trinh slippers"))) or ("locating bug code snippets"))*.