Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
hien nhanh » hien hanh, thien thanh, dien thanh
tien thanh » tien thinh, tran thanh
doanh luan » doanh nhan
den thanh » de thanh, dinh thanh, dong thanh
luan dung » lan dung, luan dong, luan hung
dung cong » dung trong
cong thuc » cong tac
pham cau » phan cau, pham ca, pham can

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 nhanh) or (((tien thanh) OR (den thanh)))) - doanh doanh luan dung cong thuc pham cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (((tien thanh) OR (den thanh)))) - doanh doanh luan dung cong thuc pham cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (((tien thanh) OR (den thanh)))) - doanh doanh luan dung cong thuc pham cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (((tien thanh) OR (den thanh)))) - doanh doanh luan dung cong thuc pham cau*.