Perhaps you should try some spelling variations:
theo chieu » ho chieu, theo chu, thi chieu
cong trong » cong thuong, duong trong, cong trinh
hanh nang » anh nang, hanh mang, hanh trang
ganh nang » anh nang, nganh nong, van nang
cao cong » cac cong, cao dang, cua cong
trong ca » trong cac, trong nha
toan cau » toan cao, toan ban, toan tap
ca toan » cua toan, va toan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (theo tieu)) sach - ((hanh nang) OR (ganh nang)) cao cong trong ca toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo tieu)) sach - ((hanh nang) OR (ganh nang)) cao cong trong ca toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo tieu)) sach - ((hanh nang) OR (ganh nang)) cao cong trong ca toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo tieu)) sach - ((hanh nang) OR (ganh nang)) cao cong trong ca toan cau*.