Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
theo phap » thi phap
phap sinh » phau sinh, phai sinh, phap tinh
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
tang cua » mang cua, hang cua, tang luan
toan tap » toan ban
ty toan » ly toan, tap toan, huy toan

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo phap sinh - hanh tang cua ((nhung cong) OR (dung cong)) ty toan tap~".
• Adding a wildcard symbol may retrieve word variants: theo phap sinh - hanh tang cua ((nhung cong) OR (dung cong)) ty toan tap*.