Perhaps you should try some spelling variations:
"hoc can tranh slippers" » "hoc canh tranh slippers", "hoc tan tran slippers", "hoc van ranh slippers", "hoc dan tranh slippers", "hoc cao tranh slippers", "hoc cac tranh slippers", "hoc can tranh slippery", "hoc can tranh 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: (((("hoc can tranh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc can tranh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc can tranh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc can tranh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.