Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
lanh manh » lanh tranh, lan anh, van manh
tong cong » trong cong, cong cong, dung cong
cua tinh » cua sinh, va tinh, ha tinh
manh cua » doanh cua, ban cua
cua tong » cua cong, cua dong, cua nong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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: ho ((hieu lang) OR (cua tinh)) - lanh manh cua tong cong tac toan ban~.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (cua tinh)) - lanh manh cua tong cong tac toan ban*.