Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung nghe » truong nghe, trinh nghe, trong nghi
trong nghe » trong nghi, cong nghe, trong nha
thong cong » trong cong, thong thong, phong chong
hoc chieu » hoc thieu, ho chieu, hoc hien
tong cong » trong cong, cong cong, dung cong
tac toan » tap toan, tam toan, hach toan
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 - thanh ((trung nghe) OR (trong nghe)) ((thong cong) or (tong cong)) tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - thanh ((trung nghe) OR (trong nghe)) ((thong cong) OR (tong cong)) tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - thanh ((trung nghe) OR (trong nghe)) ((thong cong) or (tong cong)) tac toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - thanh ((trung nghe) OR (trong nghe)) ((thong cong) or (tong cong)) tac toan ban*.