Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu cacch » hieu cach
trung cua » truong cua, trung tuan, trung cap
dang cong » dung cong
hieu cac » hieu luc, hieu va, hieu van
cua dang » cua cong, cua ban
cong ban » cong bang, cong san, cong tan
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

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