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