Perhaps you should try some spelling variations:
hanh cang » hanh cong, hanh mang, thanh cong
dung cong » dung trong
theo chu » theo chieu, cho chu, chao chu
ho chieu » theo chieu, hoc thieu, doi chieu
cang vat » dang vat, bang vat, hang va
vat dung » van dung, va dung, viet dung
dan toan » van toan, manh toan, xuan toan
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 chu) OR (ho chieu)) xanh - hanh cang vat dung cong ((dan toan) OR (dan than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chu) or (ho chieu)) xanh - hanh cang vat dung cong ((dan toan) OR (dan than)) cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo chu) or (ho chieu)) xanh - hanh cang vat dung cong ((dan toan) OR (dan than)) cau*.