Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
hanh trinh » canh tranh, hanh chinh
chung cong » chong cong, phung cong, chung thong
nhung cong » dung cong, thong cong, hang cong
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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 (thieu khang)) - hanh trinh luat ((chung cong) OR (nhung cong)) van toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thieu khang)) - hanh trinh luat ((chung cong) OR (nhung cong)) van toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu khang)) - hanh trinh luat ((chung cong) OR (nhung cong)) van toan cao*.