Perhaps you should try some spelling variations:
"dung cao code snippets" » "dung cao cong snippets", "dung cao de snippets", "dung cfd code snippets", "duong cao code snippets", "dung cho code snippets", "dung co code snippets"
"cong trinh java slippers" » "cong trinh java slippery", "cong trinh java grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: (((("cong trinh java slippers") or ("dung cao code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong trinh java slippers") OR ("dung cao code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong trinh java slippers ) or ( dung cao code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong trinh java slippers") or ("dung cao code snippets"))) or ("locating bug code snippets"))*.