Perhaps you should try some spelling variations:
"trinh dan model snippets" » "trinh dan code snippets", "trinh han model snippets", "trinh van model snippets", "trinh san model snippets", "trinh dlnm model snippets", "trinh eden model snippets", "trinh a model 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: (((("trinh dan model snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh dan model snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( trinh dan model snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh dan model snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.