Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
dung luong » dung thuong, dung phuong, dung truong
trung qua » trung quan, trong qua, trung cua
qua dung » quang dung, su dung, qua song
luong va » dung va
tuan ban » tuan bang, toan ban, luan ban
va tuan » van tuan, va quan, va toan

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 (chieu sang)) - thanh trung qua dung luong va tuan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - thanh trung qua dung luong va tuan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sang)) - thanh trung qua dung luong va tuan ban*.