Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
thuyet tach » thuyet mach, thuyet hach, thuyet xac
hoc thuyet » hoc chuyen
hanh trinh » canh tranh, hanh chinh
va phuong » va thuong, cac phuong
trinh va » trinh van, trinh vat, trinh ve
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuyet tach - hanh trinh va phuong cong ((tinh toan) or (van tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuyet tach - hanh trinh va phuong cong ((tinh toan) OR (van tuan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thuyet tach - hanh trinh va phuong cong ((tinh toan) or (van tuan)) cau*.