Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
dinh cua » dinh cuu, sinh cua, tinh cua
cong van » cong vang, cong san, song van
dinh cu » dinh cuu, dinh chuc, dinh chau
van bao » van ban, van dao

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 xanh) or (chieu tinh)) - hanh ((dinh cua) or (dinh cu)) nhung cong van bao cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu tinh)) - hanh ((dinh cua) OR (dinh cu)) nhung cong van bao cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu tinh)) - hanh ((dinh cua) or (dinh cu)) nhung cong van bao cao*.