Perhaps you should try some spelling variations:
"tra trinh java snippets" » "qua trinh java snippets", "tra trinh java slippers"
"dung sai code snippets" » "dung tai code snippets", "dung va code snippets", "dung dat code snippets", "dung sai code slippers", "dung sai core snippets"
"locating bug code snippets" » "locating bug code slippers", "locating bug core snippets", "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 ("dung sai 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 ("dung sai code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tra trinh java snippets ) or ( dung sai code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tra trinh java snippets") or ("dung sai code snippets"))) or ("locating bug code snippets"))*.