Perhaps you should try some spelling variations:
theo chua » theo chu, ho chua, cheo cua
chua xang » chua nang, chuc nang, chu bang
hanh hang » thanh hang, hang hang, hanh mang
tong cong » trong cong, cong cong, dung cong
hanh han » hanh nhan, hanh phan, hanh san
cua tong » cua cong, cua dong, cua nong
dan than » dan chan, ban than, van than

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo chua xang - ((hanh hang) OR (hanh han)) cua tong cong ((tinh toan) OR (dan than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chua xang - ((hanh hang) OR (hanh han)) cua tong cong ((tinh toan) or (dan than)) cau~".
• Adding a wildcard symbol may retrieve word variants: theo chua xang - ((hanh hang) OR (hanh han)) cua tong cong ((tinh toan) or (dan than)) cau*.