Perhaps you should try some spelling variations:
"toc thieu luc slippers" » "toc hieu luc slippers", "toc tieu luc slippers", "toc thien loc slippers", "toc thieu luc slippery", "toc thieu luc 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: (((("toc thieu luc slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toc thieu luc slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toc thieu luc slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toc thieu luc slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.