Perhaps you should try some spelling variations:
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
canh tinh » hanh tinh, manh tinh, canh tranh
ly trong » le trong, cay trong
cong tan » cong tac, cong san, cong thanh
tran tap » toan tap, tran tan, tran tuan
tinh ly » trinh ly, sinh ly, dinh ly

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)) - canh tinh ly trong cong tan tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - canh tinh ly trong cong tan tran tap*.