Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cau tinh » chau tinh, cuu tinh, cac tinh
cong san » cong tac
toan cao » toan tap
toan ban » van ban
hoc cau » hoc cao, hoc cac, hoc can

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

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