Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
trinh cua » tinh cua, trinh quan, trinh luan
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau

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

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