Perhaps you should try some spelling variations:
"cong vinh cuu snippets" » "cong trinh cuu snippets", "trong vinh cuu snippets", "cong viec cuu snippets", "cong dinh cuu snippets", "cong sinh cua snippets", "cong dinh cu snippets"
"dung java java snippets" » "dung 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 vinh cuu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong vinh cuu snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong vinh cuu snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong vinh cuu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.