Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
cua nhung » va nhung
toan cau » toan cao, toan ban, toan tap
cong li » cong ti, hong li, cong hai
li toan » le toan, li tian, ly toan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - ((thanh trung) OR (thanh tung)) cua nhung cong li toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - ((thanh trung) OR (thanh tung)) cua nhung cong li toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((thanh trung) OR (thanh tung)) cua nhung cong li toan cau*.