Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
thien quan » trien quang, lien quan, thien van
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
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 (thien quan)) - hanh trinh cua ((nhung cong) OR (dung cong)) anh tuan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thien quan)) - hanh trinh cua ((nhung cong) OR (dung cong)) anh tuan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thien quan)) - hanh trinh cua ((nhung cong) OR (dung cong)) anh tuan cau*.