Perhaps you should try some spelling variations:
thieu khang » thieu quang
chieu khong » chien chong, chu khong, chieu duong
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
tang cua » mang cua, hang cua, tang luan
cong san » cong tac
san toan » van toan, dan toan, 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 khang) OR (chieu khong)) - hanh ((tang cua) or (tranh cua)) nhung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu khang) OR (chieu khong)) - hanh ((tang cua) OR (tranh cua)) nhung cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu khang) OR (chieu khong)) - hanh ((tang cua) or (tranh cua)) nhung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu khang) OR (chieu khong)) - hanh ((tang cua) or (tranh cua)) nhung cong san toan cau*.