Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
hien xanh » hien hanh, hien nhanh, chieu xanh
cua thong » cua thuong, cua khong, suat thong
cua tong » cua cong, cua dong, cua nong
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than man » than ma, thanh san, tran manh

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 sach)) - hanh trang ((cua thong) OR (cua tong)) cong van than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu sach)) - hanh trang ((cua thong) OR (cua tong)) cong van than man.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu sach)) - hanh trang ((cua thong) OR (cua tong)) cong van than man".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu sach)) - hanh trang ((cua thong) OR (cua tong)) cong van than man*.