Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
trinh toan » thanh toan, trinh han, trinh quan
toan nhung » toan chung, toan khung, doanh nhung
nhung cong » dung cong, thong cong, hang cong
doi chiet » doi chieu, doi chi, doi viet
ban than » ban thanh, van thanh, ban hang

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: doi chiet tach - hanh trinh toan nhung cong ((tinh toan) OR (ban than)) cau~.
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - hanh trinh toan nhung cong ((tinh toan) or (ban than)) cau*.