Perhaps you should try some spelling variations:
"tang luat cong snippets" » "tang luat code snippets", "tang luan cong snippets", "nang suat cong snippets", "hang luan cong snippets", "tang thuat cong snippets", "tang luat chung snippets", "tang cua cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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: (((("tang luat cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tang luat cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( tang luat cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tang luat cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.