Perhaps you should try some spelling variations:
theo chiet » theo chieu, thep thiet
chiet tach » chieu sach
tong cong » trong cong, cong cong, dung cong
tinh cua » trinh cua, sinh cua, tranh cua
cong tan » cong tac, cong san, cong thanh
tan ran » tan tran, tan van, tan san
ran cau » van cau, ban cau, can cau

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 chiet tach - hanh ((((tinh cua) OR (tinh chat))) OR (trinh luat)) tong cong tan ran cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chiet tach - hanh ((((tinh cua) OR (tinh chat))) or (trinh luat)) tong cong tan ran cau~".
• Adding a wildcard symbol may retrieve word variants: theo chiet tach - hanh ((((tinh cua) OR (tinh chat))) or (trinh luat)) tong cong tan ran cau*.