Perhaps you should try some spelling variations:
lang trong » dung trong, cong trong, dong trong
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
trong ban » trong san, trong tan, trong quan
dien anh » tieng anh, dien dan
tang cua » mang cua, hang cua, tang luan
cua lang » cua dang, cua hang, cua mang
than cau » phan cau, than cap, thanh chau
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 ((hien hanh) or (dien anh)) - hanh tang cua lang trong ban ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (dien anh)) - hanh tang cua lang trong ban ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (dien anh)) - hanh tang cua lang trong ban ((than cau) or (toan cau))*.