Perhaps you should try some spelling variations:
dung thuong » dung trong, cong thuong, dung thuoc
chieu sach » chinh sach, chiet tach, chieu sang
hoc chieu » hoc thieu, ho chieu, hoc hien
tranh vat » tranh va, tranh van, tran van
trinh vat » trinh van, trinh luat, sinh vat
dam toan » dan toan, tam toan, dam thanh
toan ban » van ban

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 sach - canh ((tranh vat) OR (trinh vat)) ((dung thuong) or (hang thuong)) dam toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - canh ((tranh vat) OR (trinh vat)) ((dung thuong) OR (hang thuong)) dam toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - canh ((tranh vat) OR (trinh vat)) ((dung thuong) or (hang thuong)) dam toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - canh ((tranh vat) OR (trinh vat)) ((dung thuong) or (hang thuong)) dam toan ban*.