Perhaps you should try some spelling variations:
cong nguong » cong nguon, cong thuong, cong luong
thien hach » thien thanh
nguong dan » huong dan
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang cua » mang cua, hang cua, tang luan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

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