Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
canh manh » lanh manh, canh tranh, cach mang
dung cong » dung trong
hang cong » dang cong, hang nong, bang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
manh cua » doanh cua, ban cua
san toan » van toan, dan toan, manh toan
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 nganh - canh manh cua ((dung cong) or (hang cong)) san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu nganh - canh manh cua ((dung cong) OR (hang cong)) san toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - canh manh cua ((dung cong) or (hang cong)) san toan ban*.