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