Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cuon danh thi slippers" » "cuong danh thi slippers", "cuoi dan thi slippers", "cuon sach thi slippers", "cuon danh thin slippers", "cuon dinh thi slippers", "cuon dang thi slippers", "cuon danh thi slippery", "cuon danh thi 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 ("cuon danh thi slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("cuon danh thi slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( cuon danh thi slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("cuon danh thi slippers"))) or ("locating bug code snippets"))*.