Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
thanh ban » thanh san, thanh van, thanh bac
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
than ban » toan ban, than man, nhuan ban

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

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