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
trang cua » tang cua, trung cua, thang cua
tranh cua » doanh cua, manh cua
thong cuu » thong cua, thong cau, thong luu
hoc hiem » hoc hien, hoc thieu, hoc thiet

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 ((trang cua) OR (tranh cua)) thong thong cuu ((phuong cau) OR (phuong cham))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hiem ngan - hanh ((trang cua) OR (tranh cua)) thong thong cuu ((phuong cau) or (phuong cham))~".
• Adding a wildcard symbol may retrieve word variants: hoc hiem ngan - hanh ((trang cua) OR (tranh cua)) thong thong cuu ((phuong cau) or (phuong cham))*.