Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dong van cuc snippets" » "dong van code snippets", "duong van cuc snippets", "dang van cuc snippets", "dong von cuc snippets", "dong van duc snippets", "dong van luc snippets", "dong van cu snippets"
"python using java snippets" » "python using data 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: (((("dong van cuc snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong van cuc snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong van cuc snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong van cuc snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.