Perhaps you should try some spelling variations:
"phung hoc chi snippets" » "phung ho chi snippets", "chung hoc chi snippets", "khung hoc chi snippets", "phung hoc chia snippets", "phung hoc cho snippets", "phung hoc chu 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: (((("phung hoc chi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phung hoc chi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phung hoc chi snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phung hoc chi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.