Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
nhat thuong » nhat huong, phan thuong, luat thuong
hieu sang » chieu sang, hieu lang, hieu quang
nha thong » nhan thong, nghe thong, nha truong
thanh cau » thanh chau, thanh mau, thanh ca
nhanh cau » nhanh cay, thanh chau, nhanh ha
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - thanh trong ((nha thong) or (nhat thuong)) cong tan ((thanh cau) or (nhanh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - thanh trong ((nha thong) OR (nhat thuong)) cong tan ((thanh cau) OR (nhanh cau)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - thanh trong ((nha thong) or (nhat thuong)) cong tan ((thanh cau) or (nhanh cau))*.