Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
truong hua » truong cua, truong sua, truong quan
truong huu » truong hoc, duong huu, truong cua
khong cong » thong cong, khong cang, chong cong
hieu manh » chieu xanh, dieu hanh, hien hanh
cong san » cong tac
san chan » san chang, dan chan, san chay
chan tu » phan tu, han tu, chon tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) or (hieu nganh)) - thanh ((truong hua) OR (truong huu)) khong cong san chan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (hieu nganh)) - thanh ((truong hua) OR (truong huu)) khong cong san chan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) or (hieu nganh)) - thanh ((truong hua) OR (truong huu)) khong cong san chan tu".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (hieu nganh)) - thanh ((truong hua) OR (truong huu)) khong cong san chan tu*.