Perhaps you should try some spelling variations:
"trang tri hoi snippets" » "tran thi hoi snippets", "quang tri hoi snippets", "trang tri hoc snippets", "trang tri doi snippets", "trang tri moi 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: (((("trang tri hoi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trang tri hoi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trang tri hoi snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trang tri hoi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.