Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
cua trong » cua truong, cua trung, qua trong
tang cua » mang cua, hang cua, tang luan
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hanh - hanh tang cua trong cong san ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - hanh tang cua trong cong san ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh tang cua trong cong san ((toan cau) or (toan tap))*.