Perhaps you should try some spelling variations:
"dung sinh java snippets" » "duong sinh java snippets", "dang sinh java snippets", "dung ninh java snippets", "dung trinh java snippets", "dung using java snippets", "dung sinh va snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung ca code snippets" » "dung cua code snippets", "dung cac code snippets", "dung cam code snippets", "dung cfd 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: (((("dung sinh java snippets") or ("dung ca code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung sinh java snippets") OR ("dung ca code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung sinh java snippets ) or ( dung ca code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung sinh java snippets") or ("dung ca code snippets"))) or ("locating bug core snippets"))*.