Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
nhung tuong » nhung huong, hung vuong, nhung cong
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh dang » hanh dong, hanh dung, hanh mang
anh dang » anh dong, anh dung, anh bang
van tai » von tai, van tuan
tai cau » tai cac, tai cao

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 dang) or (anh dang)) van ((nhung tuong) OR (nhung phuong)) van tai cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((hanh dang) OR (anh dang)) van ((nhung tuong) OR (nhung phuong)) van tai cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((hanh dang) or (anh dang)) van ((nhung tuong) OR (nhung phuong)) van tai cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh dang) or (anh dang)) van ((nhung tuong) OR (nhung phuong)) van tai cau*.