Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
trinh quan » tinh quang, trinh luat, trinh han
hien hanh » dieu hanh
trinh cua » tinh cua, trinh luat, trinh luan
trong van » trong cac
van tan » van tuan, van ban, van tai
tan tat » ban tat, toan tap, toan tai

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 hanh) or (chieu xanh)) - hanh ((trinh cua) OR (trinh quan)) dung trong van tan tat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (chieu xanh)) - hanh ((trinh cua) OR (trinh quan)) dung trong van tan tat*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien hanh) or (chieu xanh)) - hanh ((trinh cua) OR (trinh quan)) dung trong van tan tat*".