Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
phuong cong » phuong dong, phong cong, phung cong
thieu sang » chieu sang, thieu quang, hieu lang
tranh hang » trinh han, tran hoang, tran hong
va phuong » va thuong, cac phuong
cong lang » cong vang, cong luong, cong quang
tuan cau » toan cau, tuan cu, thuan cam
quan cau » quang cao, toan cau, quan ha

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)) - tranh hang va phuong cong lang ((tuan cau) OR (quan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - tranh hang va phuong cong lang ((tuan cau) OR (quan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thieu khang)) - tranh hang va phuong cong lang ((tuan cau) OR (quan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu khang)) - tranh hang va phuong cong lang ((tuan cau) OR (quan cau))*.