Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap
tinh va » trinh van, trinh vat, tinh gia

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - hanh ((tinh va) or (tich va)) thong cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - hanh ((tinh va) OR (tich va)) thong cong tan than cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh ((tinh va) or (tich va)) thong cong tan than cau*.