Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
chau tinh » ha tinh, cua tinh, cac tinh
trinh va » trinh van, trinh vat, trinh ve
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

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