Perhaps you should try some spelling variations:
vien nganh » vien thanh
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh vat » trinh luat, sinh vat, trinh han
trinh van » trinh han, trinh quan, trinh toan
cong sat » cong suat, cong san, cong hat
sat phan » sat nhan, vat phan, xuat phan

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 (vien nganh)) - canh ((trinh vat) or (trinh van)) nhung cong sat phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (vien nganh)) - canh ((trinh vat) OR (trinh van)) nhung cong sat phan tu.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (vien nganh)) - canh ((trinh vat) or (trinh van)) nhung cong sat phan tu*.