Perhaps you should try some spelling variations:
"dung thi toan snippets" » "dung thi code snippets", "dung tai toan snippets", "dung tri toan snippets", "dung chi toan snippets", "dung thi tran snippets", "dung thi hoan snippets", "dung thi loan snippets"
"locating bug core snippets" » "locating bug code snippets"
"hanh java java snippets" » "hanh va java 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: (((("hanh java java snippets") or ("dung thi toan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh java java snippets") OR ("dung thi toan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hanh java java snippets ) or ( dung thi toan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh java java snippets") or ("dung thi toan snippets"))) or ("locating bug core snippets"))*.