Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
tich toan » tinh toan, tich than, trinh toan
ban cong » bang cong, van cong, phan cong
tap toan » tap doan, tap quan, bai toan
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh trung cua ban cong ((tich toan) or (tap toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trung cua ban cong ((tich toan) OR (tap toan)) tap*.