Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dang using java snippets" » "dang sinh java snippets", "data using java snippets", "dang ung java snippets", "dang using data snippets"
"dung luan data snippets" » "dung luat dat snippets", "dung luan dac snippets", "dung luan danh 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: (((("dang using java snippets") or ("dung luan data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang using java snippets") OR ("dung luan data snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dang using java snippets ) or ( dung luan data snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang using java snippets") or ("dung luan data snippets"))) or ("locating bug core snippets"))*.