Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"tran manh thin slippers" » "tran minh thin slippers", "tran thanh thin slippers", "tran van thin slippers", "tran manh thinh slippers", "tran canh thin slippers", "tran danh thin slippers", "tran manh thin slippery", "tran manh thin 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 ("tran manh thin slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("tran manh thin slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( tran manh thin slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("tran manh thin slippers"))) or ("locating bug code snippets"))*.