Perhaps you should try some spelling variations:
dung chung » dung cong, dung ung, dung trung
chieu sach » chinh sach, chiet tach, chieu sang
chung manh » hung manh, nhung manh, chung minh
hoc chieu » hoc thieu, ho chieu, hoc hien
manh toan » thanh toan, anh tuan, tinh toan
tung bay » vung bay, tuong ban, tung dan
toan ban » van ban
tung ap » tang ap, tung dan, tung mai

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 - manh ((tung ap) or (tung bay)) dung chung manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - manh ((tung ap) OR (tung bay)) dung chung manh toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - manh ((tung ap) or (tung bay)) dung chung manh toan ban*.