Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hoc chieu » hoc thieu, ho chieu, hoc hien
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
dan toan » van toan, dan than, manh toan
toan ban » van ban
hanh va » hang va, hanh vi
han va » hang va, nhan va, ban va

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