Perhaps you should try some spelling variations:
thuyet tach » thuyet mach, thuyet hach, thuyet xac
hoc thuyet » hoc chuyen
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
van tuan » van quan, van ban

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 thong cong ((tinh toan) or (((van tuan) OR (anh tuan)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuyet tach - hanh trinh va thong cong ((tinh toan) OR (((van tuan) OR (anh tuan)))) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thuyet tach - hanh trinh va thong cong ((tinh toan) or (((van tuan) OR (anh tuan)))) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thuyet tach - hanh trinh va thong cong ((tinh toan) or (((van tuan) OR (anh tuan)))) cau*.