Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
manh tung » manh hung, thanh tung
tung cua » trung cua, tuong cua, dung cua
dong von » dong co, dong hoc, dong hoa
dung von » dung cong, dung va
quan cau » quang cao, quan ha, quan cua
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 nhanh - manh tung cua cong ((dong von) OR (dung von)) ((quan cau) OR (toan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nhanh - manh tung cua cong ((dong von) OR (dung von)) ((quan cau) or (toan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - manh tung cua cong ((dong von) OR (dung von)) ((quan cau) or (toan cau))*.