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