Perhaps you should try some spelling variations:
thanh trung » thanh tung
manh trung » manh tung, manh hung, sinh trung
hieu xanh » chieu xanh, hieu manh, hieu nganh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
than cap » khan cap, thanh lap, thanh cac
phan cau » phan dau, phan cac, phan tu

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: doc hieu xanh - ((manh trung) OR (thanh trung)) cua dung cong tac ((than cap) OR (phan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - ((manh trung) OR (thanh trung)) cua dung cong tac ((than cap) or (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((manh trung) OR (thanh trung)) cua dung cong tac ((than cap) or (phan cau))*.