Perhaps you should try some spelling variations:
"dong cao trong slippers" » "dong cao truong slippers", "dong cay trong slippers", "dong tao trong slippers", "duong cao trong slippers", "dong co trong slippers", "dong cho trong slippers", "dong cao trong slippery", "dong cao trong 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 cao trong 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 cao trong slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong cao trong slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong cao trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.