Perhaps you should try some spelling variations:
"dong che cach snippets" » "dong che code snippets", "dong chen cach snippets", "duong che cach snippets", "dong cho cach snippets", "dong chen gach snippets", "dong che tac snippets", "dong ve cach snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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: (((("dong che cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong che cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong che cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong che cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.