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