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