Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
cua dong » chua dong, cua cong, cua dang
qua dung » quang dung, su dung, qua song
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 trinh) or (canh tranh)) ((cua dong) or (qua dung)) cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((hanh trinh) OR (canh tranh)) ((cua dong) OR (qua dung)) cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh trinh) or (canh tranh)) ((cua dong) or (qua dung)) cong dan than cau*.