Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"tung manh tran snippets" » "hung manh tran snippets", "duong manh tran snippets", "luong manh tran snippets", "tung manh toan snippets", "tung manh tuan snippets", "tung canh tranh snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java core snippets") or ("tung manh tran snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("tung manh tran snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( tung manh tran snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("tung manh tran snippets"))) or ("locating bug code snippets"))*.