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