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