Perhaps you should try some spelling variations:
"trinh van con snippets" » "trinh han con snippets", "trinh quan con snippets", "trinh toan con snippets", "trinh van cong snippets", "trinh van bon snippets", "trinh van co snippets"
"hanh va java snippets" » "hang va java snippets", "hanh vi java snippets", "hanh java java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("hanh va java snippets") or ("trinh van con snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh va java snippets") OR ("trinh van con snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh va java snippets ) or ( trinh van con snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh va java snippets") or ("trinh van con snippets"))) or ("locating bug code snippets"))*.