Perhaps you should try some spelling variations:
"dong luan data slippers" » "dung luan data slippers", "tong luan data slippers", "dong xuan data slippers", "dong luat dat slippers", "dong luan dac slippers", "dong luan danh slippers", "dong luan data slippery", "dong luan data grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dong luan data slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong luan data slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong luan data slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong luan data slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.