Perhaps you should try some spelling variations:
trinh khan » trinh han, trinh phan, trinh khai
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
lanh manh » lanh tranh, lan anh, van manh
dang cong » dung cong
manh cua » doanh cua, ban cua
cua dang » cua cong, cua ban
khan ap » khan cap, han ap, khan dam

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: toc ((hieu manh) OR (chieu sach)) - lanh manh cua dang cong trinh khan ap~.
• Adding a wildcard symbol may retrieve word variants: toc ((hieu manh) or (chieu sach)) - lanh manh cua dang cong trinh khan ap*.