Perhaps you should try some spelling variations:
phan cong » thanh cong
theo hoc » thao hoc, te hoc, cho hoc
theo hop » theo phap, thao hoc, theo ucp
anh mang » hanh mang, anh bang, anh dang
mang cua » manh cua, dung cua, ban cua
ban cong » bang cong, van cong, ban huong
bai toan » bai tap
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 hoc) or (theo hop)) sach - anh mang cua ((ban cong) OR (phan cong)) bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo hoc) OR (theo hop)) sach - anh mang cua ((ban cong) OR (phan cong)) bai toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo hoc) or (theo hop)) sach - anh mang cua ((ban cong) OR (phan cong)) bai toan cao*".