Perhaps you should try some spelling variations:
"qua trinh java snippets" » "qua kinh java snippets", "qua trinh 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: (((("qua trinh 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: (((("qua trinh java snippets") OR ("cong cua code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( qua trinh java snippets ) or ( cong cua code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("qua trinh java snippets") or ("cong cua code snippets"))) or ("locating bug code snippets"))*.