Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
thien dang » thien bang, thien danh, thien nang
chieu sach » chinh sach, chiet tach, chieu sang
va phuong » va thuong, cac phuong
va thong » va thuong, he thong, va cong
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
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: hoc ((thien dang) or (chieu sach)) - doanh doanh ((va thong) OR (va phuong)) cong tam toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien dang) OR (chieu sach)) - doanh doanh ((va thong) OR (va phuong)) cong tam toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien dang) or (chieu sach)) - doanh doanh ((va thong) OR (va phuong)) cong tam toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien dang) or (chieu sach)) - doanh doanh ((va thong) OR (va phuong)) cong tam toan cau*.