Perhaps you should try some spelling variations:
"trong san cong snippets" » "trong san code snippets", "trong cac cong snippets", "cong san cong snippets", "dong san cong snippets", "trong sang cong snippets", "trong van cong snippets", "trong ban 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: (((("trong san 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: (((("trong san cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( trong san cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trong san cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.