Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"luc tinh son snippets" » "loc tinh son snippets", "lac tinh son snippets", "luc binh son snippets", "luc tinh toan snippets", "luc dinh so snippets", "luc tinh hoc 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 ("luc tinh son snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("luc tinh son snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( luc tinh son snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("luc tinh son snippets"))) or ("locating bug code snippets"))*.