Perhaps you should try some spelling variations:
"cong doi cach snippets" » "cong doi code snippets", "vong doi cach snippets", "cong dot cach snippets", "cong goi cach snippets", "cong loi cach snippets", "cong doi canh snippets", "cong dong 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: (((("cong doi 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: (((("cong doi cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong doi cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong doi cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.