Perhaps you should try some spelling variations:
"van trinh java snippets" » "van thinh java snippets", "van tinh java snippets", "dan trinh java snippets", "van trinh java slippers"
"cong cong code snippets" » "cong dong code snippets", "trong cong code snippets", "dung cong code snippets", "cong cong co snippets", "cong cong che snippets", "cong cong coc snippets", "cong cong 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: (((("van trinh java snippets") or ("cong cong code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van trinh java snippets") OR ("cong cong code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van trinh java snippets ) or ( cong cong code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van trinh java snippets") or ("cong cong code snippets"))) or ("locating bug code snippets"))*.