Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"data using data snippets" » "data using java snippets", "data using sat snippets", "data missing data snippets"
"dung tao robot snippets" » "dung cho robot snippets", "dung tai robot snippets", "dung bao robot snippets", "dung tay robot 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 data snippets") or ("dung tao robot snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("data using data snippets") OR ("dung tao robot snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( data using data snippets ) or ( dung tao robot snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("data using data snippets") or ("dung tao robot snippets"))) or ("locating bug core snippets"))*.