Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung vung » nhung dung, nhung huong, nhung tuong
cua nhung » va nhung
vung tinh » dung tinh, hung tinh, vung sinh
van manh » van minh, van anh, van hanh
manh cua » doanh cua, ban cua
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 quang) OR (chieu tinh)) - van manh cua nhung vung tinh toan ban~.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (chieu tinh)) - van manh cua nhung vung tinh toan ban*.