Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » thong cong, hang cong, nhung don
hieu lang » hieu quang, nhieu tang, hieu van
trang cua » tranh cua, tang cua, trung cua
dung cong » dung trong
dan chan » dan gian, dan ca, van chat
chan tu » phan tu, han tu, chon tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) OR (hieu lang)) - hanh trang cua ((nhung cong) or (dung cong)) dan chan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - hanh trang cua ((nhung cong) OR (dung cong)) dan chan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu lang)) - hanh trang cua ((nhung cong) or (dung cong)) dan chan tu".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu lang)) - hanh trang cua ((nhung cong) or (dung cong)) dan chan tu*.