Perhaps you should try some spelling variations:
"tang thi java snippets" » "dang thi java snippets", "tang tai java snippets", "hoang thi java snippets", "tang think java snippets"
"dung cho con snippets" » "dung cho cong snippets", "dung cho lon snippets", "dung cho can 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: (((("tang thi java snippets") or ("dung cho con snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tang thi java snippets") OR ("dung cho con snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tang thi java snippets ) or ( dung cho con snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tang thi java snippets") or ("dung cho con snippets"))) or ("locating bug code snippets"))*.