Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
doanh doanh » toan doanh, doanh hoan, doanh thanh
tran thanh » ban thanh, van thanh, quan thanh
nhung cong » dung cong, thong cong, hang cong
doanh cua » doanh luan
cua nhung » va nhung
cong thuc » cong tac
pham cau » phan cau, pham can, pha cau
pham ca » pham can, pham ma, pham va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (tran thanh)) - doanh doanh cua nhung cong thuc ((pham cau) or (pham ca))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (tran thanh)) - doanh doanh cua nhung cong thuc ((pham cau) OR (pham ca)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (tran thanh)) - doanh doanh cua nhung cong thuc ((pham cau) or (pham ca))*.