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