Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thi chieu » thi chien, thi hieu, theo chieu
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
tang cua » mang cua, hang cua, tang luan
tap toan » tap doan, tap quan
bai toan » bai tap

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

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