Perhaps you should try some spelling variations:
"cong viet data slippers" » "cong viec data slippers", "thong viet data slippers", "nang viet data slippers", "cong viet dat slippers", "cong viet ta slippers", "cong lieu data slippers", "cong viet data slippery", "cong viet 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"

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 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: (((("cong viet data slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong viet data slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong viet data slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.