Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
phuong dan » phuong danh, phuong doan, huong dan
tien manh » tien anh, tien thanh, tieng anh
hoc tien » hoc tieng, hoc hien, hoc vien
manh va » hanh va, anh va, lanh va
minh va » tinh va, sinh va, sinh vat
tai cao » thai cao, tai sao, tai cac
tao cao » bao cao, toan cao

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 tien manh - lanh ((manh va) OR (minh va)) dung phuong dan ((tai cao) OR (tao cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tien manh - lanh ((manh va) OR (minh va)) dung phuong dan ((tai cao) or (tao cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - lanh ((manh va) OR (minh va)) dung phuong dan ((tai cao) or (tao cao))*.