Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"using java core snippets" » "using data core snippets"
"dung doi sach snippets" » "huong doi sach snippets", "dung tai sach snippets", "dung co sach snippets", "dung doc sach snippets", "dung moi sach snippets", "dung do sach 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 ("dung doi sach snippets"))) or ("locating bugs code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("dung doi sach snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( dung doi sach snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("dung doi sach snippets"))) or ("locating bugs code snippets"))*.