Perhaps you should try some spelling variations:
vien nganh » vien thanh
hanh trinh » canh tranh, hanh chinh
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
trinh va » trinh van, trinh vat, trinh ve
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chinh sach) or (vien nganh)) - hanh trinh va dung cong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chinh sach) OR (vien nganh)) - hanh trinh va dung cong manh toan cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chinh sach) or (vien nganh)) - hanh trinh va dung cong manh toan cao*.