Perhaps you should try some spelling variations:
thanh tung » thanh cong
hoc chieu » ho chieu, hoc hien, hoc dieu
hoc thieu » toc thieu, hoc hien
van thanh » ban thanh, van tuan
ban cong » bang cong, van cong, phan cong
tap toan » tap doan, tap quan, bai toan
tung ca » trung ca, tang ca, cung ca
ca ban » cua ban, can ban, cac 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) OR (hoc thieu)) sach - thanh tung ca ban cong ((tap toan) or (van thanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc thieu)) sach - thanh tung ca ban cong ((tap toan) OR (van thanh)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) OR (hoc thieu)) sach - thanh tung ca ban cong ((tap toan) or (van thanh)) cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) OR (hoc thieu)) sach - thanh tung ca ban cong ((tap toan) or (van thanh)) cao*.