Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thanh trang » thanh trung, hanh trang, thanh thang
thieu sang » chieu sang, thieu quang, hieu lang
nhung cong » dung cong, thong cong, hang cong
cong hach » cong sach, cong thanh, cong khanh
trang va » tran van, hang va
toan cao » toan tap
toan ban » van ban

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) or (thieu khang)) - thanh trang va nhung cong hach ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - thanh trang va nhung cong hach ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thieu khang)) - thanh trang va nhung cong hach ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu khang)) - thanh trang va nhung cong hach ((toan cao) OR (toan ban))*.