Perhaps you should try some spelling variations:
"dong chen code snippets" » "dong chan code snippets", "dong che code snippets", "dong chuyen code snippets", "dong chen core snippets"
"anh java java slippers" » "anh va java slippers", "anh java java slippery", "anh java java grippers"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code 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: (((("anh java java slippers") or ("dong chen code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("anh java java slippers") OR ("dong chen code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( anh java java slippers ) or ( dong chen code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("anh java java slippers") or ("dong chen code snippets"))) or ("locating bug code snippets"))*.