Perhaps you should try some spelling variations:
"dong java java snippets" » "dong va java snippets"
"cong tan cach snippets" » "cong tac cach snippets", "cong san cach snippets", "cong thanh cach snippets", "cong dan cach snippets", "cong tap cach snippets", "cong tinh cach 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: (((("dong java java snippets") or ("cong tan cach snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong java java snippets") OR ("cong tan cach snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong java java snippets ) or ( cong tan cach snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong java java snippets") or ("cong tan cach snippets"))) or ("locating bug code snippets"))*.