Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"dan xac pham snippets" » "dan tac pham snippets", "dan san pham snippets", "dan duc pham snippets", "dan bac pham snippets", "dan cac pham snippets", "dan xa pham 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 ("dan xac pham snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("dan xac pham snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( dan xac pham snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("dan xac pham snippets"))) or ("locating bug code snippets"))*.