Perhaps you should try some spelling variations:
phuong cham » phuong phap, phuong thao
phuong cau » huong cau, phuong cach, thuong chau
hiem ngan » kim ngan, viem gan
hanh tang » hanh trang, anh tang, hanh mang
cua thong » cua thuong, cua khong, cua tong
thong cua » thong quan, thong tu, huong cua
hoc hiem » hoc hien, hoc thieu, hoc thiet
tang cua » mang cua, hang cua, tang luan

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 hiem ngan - hanh tang cua thong thong cua ((phuong cau) OR (phuong cham))~.
• Adding a wildcard symbol may retrieve word variants: hoc hiem ngan - hanh tang cua thong thong cua ((phuong cau) or (phuong cham))*.