Perhaps you should try some spelling variations:
"tranh hang cac snippets" » "trinh han cac snippets", "tran hoang cac snippets", "tranh hang ca snippets", "tranh hang cau snippets", "tranh bang cac snippets"
"dung java java snippets" » "dung va 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: (((("tranh hang cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tranh hang cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tranh hang cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tranh hang cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.