Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hien xanh » hien hanh, hien nhanh, chieu xanh
anh quang » anh xquang, anh quan, nhanh quang
van thanh » ban thanh, van tuan
thanh ban » thanh san, thanh van, thanh bac
va duong » van duong, va tuong, va huong
cong van » cong vang, cong san, song van
va dung » van dung, vat dung, va ung

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)) - anh quang ((va dung) or (va duong)) cong van thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu sach)) - anh quang ((va dung) OR (va duong)) cong van thanh ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu sach)) - anh quang ((va dung) or (va duong)) cong van thanh ban*.