Perhaps you should try some spelling variations:
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
tuan dung » tuan duong, tran dung, tuan dang
cong dung » cuong dung, cong dong, cong luong
dung toan » dung doanh, dung thang, dung thanh
anh quan » anh tuan, ban quan, anh nhan
tan dung » tran dung, tin dung, van dung
toan cau » toan cao, toan ban, toan tap

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) OR (hien hanh)) - anh quan ((tuan dung) OR (tan dung)) cong dung toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien hanh)) - anh quan ((tuan dung) or (tan dung)) cong dung toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien hanh)) - anh quan ((tuan dung) or (tan dung)) cong dung toan cau*.