Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
tieu sach » chieu sach, dien sach, te sach
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
anh tang » anh bang, anh dang, anh nang
toan cau » 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 tieu sach - anh tang ((cua khong) OR (hua khong)) cong trinh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - anh tang ((cua khong) OR (hua khong)) cong trinh toan cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh tang ((cua khong) OR (hua khong)) cong trinh toan cau*.