Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
mang cua » manh cua, dung cua, ban cua
cua dung » cua dang, cua dong, qua dung
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - hanh mang cua dung cong ((dan than) or (dan chan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh mang cua dung cong ((dan than) OR (dan chan)) ban*.