Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
thong cong » trong cong, tong cong, thong thong
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
trang va » tran van, hang va
van than » van thanh, van thang, van tuan
than tu » thanh tu, thang tu, phan 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 ((hien xanh) or (chieu sach)) - hanh trang va ((thong cong) or (dung cong)) van than tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu sach)) - hanh trang va ((thong cong) OR (dung cong)) van than tu.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu sach)) - hanh trang va ((thong cong) or (dung cong)) van than tu*.