Perhaps you should try some spelling variations:
"tra trinh java snippets" » "qua trinh java snippets", "tra trinh java slippers"
"trung dai code snippets" » "truong dai code snippets", "truong dao code snippets", "trung tam code snippets", "trung dai de snippets", "trung dai cong snippets", "trung dai 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 ("trung dai 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 ("trung dai code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tra trinh java snippets ) or ( trung dai code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tra trinh java snippets") or ("trung dai code snippets"))) or ("locating bug code snippets"))*.