Perhaps you should try some spelling variations:
"tra trinh java snippets" » "qua trinh java snippets", "tra trinh java slippers"
"dong luc code snippets" » "nang luc code snippets", "dong lbm code snippets", "dong luc cong snippets", "dong luc code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs 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: (((("tra trinh java snippets") or ("dong luc code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tra trinh java snippets") OR ("dong luc code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tra trinh java snippets ) or ( dong luc code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tra trinh java snippets") or ("dong luc code snippets"))) or ("locating bug code snippets"))*.