Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
truong cao » truong dai
tuong cong » truong cong, trong cong, tong cong
hoc thieu » toc thieu, hoc hien
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 - hanh ((trung va) or (truong cao)) tuong cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((trung va) OR (truong cao)) tuong cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trung va) or (truong cao)) tuong cong dan toan cau*.