Perhaps you should try some spelling variations:
"dan trinh luan snippets" » "dan trinh luat snippets", "dan trinh quan snippets", "dan trinh han snippets", "dan tinh luan snippets", "van trinh luan snippets", "hanh trinh luan snippets"
"hanh java java slippers" » "hanh va java slippers", "hanh java java slippery", "hanh java java grippers"
"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 java java slippers") or ("dan trinh luan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh java java slippers") OR ("dan trinh luan snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh java java slippers ) or ( dan trinh luan snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh java java slippers") or ("dan trinh luan snippets"))) or ("locating bug code snippets"))*.