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