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