Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hanh trinh » canh tranh, hanh chinh
suat trong » luat trong, thuat trong, vat trong
hieu manh » chieu xanh, dieu hanh, hien hanh
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu manh) OR (hieu nganh)) - hanh trinh ((suat trong) OR (suat thong)) cong tac toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((hieu manh) OR (hieu nganh)) - hanh trinh ((suat trong) or (suat thong)) cong tac toan ban~".
• Adding a wildcard symbol may retrieve word variants: toc ((hieu manh) OR (hieu nganh)) - hanh trinh ((suat trong) or (suat thong)) cong tac toan ban*.