Perhaps you should try some spelling variations:
"data using java snippets" » "data using data snippets", "data using java slippers"
"dong hoc code snippets" » "dong co code snippets", "dong luc code snippets", "dong hoc co snippets", "dong hoc cong snippets", "dong hoc de snippets", "dong hoc code slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("dong hoc code snippets") or ("data using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong hoc code snippets") OR ("data using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong hoc code snippets ) or ( data using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong hoc code snippets") or ("data using java snippets"))) or ("locating bug code snippets"))*.