Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thien anh » thien danh, tien anh, thien thanh
trinh vat » trinh van, trinh luat, sinh vat
hang cong » dang cong, hang nong, bang cong
trinh va » trinh van, trinh ve, trinh vi
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien anh) or (chieu xanh)) - hanh ((trinh va) OR (trinh vat)) hang cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (chieu xanh)) - hanh ((trinh va) OR (trinh vat)) hang cong tan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) or (chieu xanh)) - hanh ((trinh va) OR (trinh vat)) hang cong tan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) or (chieu xanh)) - hanh ((trinh va) OR (trinh vat)) hang cong tan than cau*.