Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh qua » trinh qua, tranh quang, trinh quan
thanh qua » thanh quan, thanh qui, hanh qua
tranh cua » doanh cua, manh cua
dung cong » dung trong
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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 ((((tranh qua) OR (thanh qua))) OR (tranh cua)) dung cong san than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((((tranh qua) OR (thanh qua))) or (tranh cua)) dung cong san than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((((tranh qua) OR (thanh qua))) or (tranh cua)) dung cong san than cau*.