Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
hoach canh » hoach dinh, hoach bang, hoach mang
danh thin » danh thanh, danh thang, dang thien
canh thin » cach thien, manh thinh, can thi
danh tri » dinh tri, thanh tri, danh tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((thuoc sach) OR (thuat sach)) ((danh tri) or (danh thin)) ) or ( thu hoach canh thin ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((thuoc sach) OR (thuat sach)) ((danh tri) OR (danh thin)) ) OR ( thu hoach canh thin ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((thuoc sach) OR (thuat sach)) ((danh tri) or (danh thin)) ) or ( thu hoach canh thin ))*".