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