Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hieu manh » chieu xanh, dieu hanh, hien hanh
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
dung cong » dung trong
cong tac » cong ty
tac ran » tac can, tac van, tac quan
ran cau » van cau, ban cau, can cau

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 manh) or (hieu nganh)) - thanh ((trung cua) or (trung cap)) dung cong tac ran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - thanh ((trung cua) OR (trung cap)) dung cong tac ran cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu nganh)) - thanh ((trung cua) or (trung cap)) dung cong tac ran cau*.