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