Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
lanh hanh » lanh manh, lenh hanh, xanh hanh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
hanh va » hang va, hanh vi
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (theo chieu)) xanh - lanh hanh va dung cong ((dan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo chieu)) xanh - lanh hanh va dung cong ((dan toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo chieu)) xanh - lanh hanh va dung cong ((dan toan) or (dan than)) cau*.