Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu xanh » chieu sach, chieu sang, chieu tinh
hien xanh » hien hanh, hien nhanh, hien khanh
anh quang » anh xquang, anh quan, tinh quang
cua nhung » va nhung
cong van » cong vang, cong san, song van
ban cu » ban cua, ban cau, ban 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 xanh)) - ((anh quang) or (nhanh quang)) cua nhung cong van ban cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu xanh)) - ((anh quang) OR (nhanh quang)) cua nhung cong van ban cu.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu xanh)) - ((anh quang) or (nhanh quang)) cua nhung cong van ban cu*.