Perhaps you should try some spelling variations:
trung thuat » trong thuat, thuong thuat, trung tuan
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
thong cong » tong cong, thong thong, phong chong
van van » tan van, san van, van vat

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