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 vang » cong lang, cong quang, cong ngang
vang tuan » van tuan, vong tuan, quang tuan
tuan cau » toan cau, quan cau, tuan cu

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 vang tuan 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 vang tuan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu khang)) - tranh hang va phuong cong vang tuan cau*.