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