Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, theo chu, thi chieu
hanh trinh » canh tranh, hanh chinh
chua dang » cua dang, chua dong, chua nang
dang cong » dung cong
ho chieu » hoc thieu, doi chieu, mot chieu
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: ((ho chieu) or (theo chieu)) sach - ((thanh trung) or (hanh trinh)) chua dang cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - ((thanh trung) OR (hanh trinh)) chua dang cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - ((thanh trung) or (hanh trinh)) chua dang cong tac toan cao*.