Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
cua truong » cua trung, xuan truong, cac truong
hieu lang » chieu sang, hieu quang, nhieu tang
cua nhung » va nhung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trung ((cua nhung) OR (cua truong)) cong tac toan cao~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trung ((cua nhung) or (cua truong)) cong tac toan cao*.