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
cua nhung » va nhung
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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)) - anh tang cua nhung cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu khang) OR (chieu khong)) - anh tang cua nhung cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu khang) or (chieu khong)) - anh tang cua nhung cong tap toan cao*.