Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh sinh » hanh tinh, hanh dinh, hanh chinh
hinh sinh » tinh sinh, hinh dinh, hinh kinh
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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 sinh) or (hinh sinh)) ((cua dung) OR (cua dang)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((hanh sinh) OR (hinh sinh)) ((cua dung) OR (cua dang)) cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((hanh sinh) or (hinh sinh)) ((cua dung) OR (cua dang)) cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh sinh) or (hinh sinh)) ((cua dung) OR (cua dang)) cong san toan cau*.