Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
trinh chua » trinh chuan, trinh cua, trinh chu
chua dong » cua dong, ha dong, huy dong
dong cong » duong cong, dung cong, dang cong
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: ho ((nhieu tang) or (hieu quang)) - hanh trinh chua dong cong ((bai toan) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((nhieu tang) OR (hieu quang)) - hanh trinh chua dong cong ((bai toan) OR (tan tran)) cau.
• Adding a wildcard symbol may retrieve word variants: ho ((nhieu tang) or (hieu quang)) - hanh trinh chua dong cong ((bai toan) or (tan tran)) cau*.