Perhaps you should try some spelling variations:
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
nhung dung » phuong dung, ung dung, trung dung
thong dung » thong cong, thong thuong
canh manh » lanh manh, canh tranh, cach mang
vanh tuan » anh tuan, van tuan, manh tuan
manh cua » doanh cua, ban cua
tuan cau » toan cau, quan cau, tuan cu

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: hoc ((thieu sang) OR (chieu sang)) - canh manh cua ((nhung dung) OR (thong dung)) vanh tuan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sang)) - canh manh cua ((nhung dung) OR (thong dung)) vanh tuan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sang)) - canh manh cua ((nhung dung) OR (thong dung)) vanh tuan cau*.