Perhaps you should try some spelling variations:
"hoc ung java snippets" » "hoc using java snippets", "hoc ngu java snippets", "hoc ung va snippets", "hoc ung java slippers"
"cong cua code snippets" » "cong cu code snippets", "dong cua code snippets", "huong cua code snippets", "cong cua cong snippets", "cong cua co snippets", "cong cfd code snippets", "cong cua code slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("hoc ung java snippets") or ("cong cua code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc ung java snippets") OR ("cong cua code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc ung java snippets ) or ( cong cua code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc ung java snippets") or ("cong cua code snippets"))) or ("locating bug code snippets"))*.