Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chua xang » chua nang, chuc nang, chua dong
cua nhung » va nhung
chu bang » thu bang, chuc nang, chu quang
hanh han » hanh nhan, hanh phan, hanh san
tap toan » tap doan, tap quan
bai toan » bai tap
han cua » hang cua, nhan cua, than cua

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

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