Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
choc sinh » cho sinh, thuoc sinh, hoa sinh
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan 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 sinh) or (choc sinh)) sach - thanh trung cua nhung cong san ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sinh) OR (choc sinh)) sach - thanh trung cua nhung cong san ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sinh) or (choc sinh)) sach - thanh trung cua nhung cong san ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ((hoc sinh) or (choc sinh)) sach - thanh trung cua nhung cong san ((toan cau) OR (toan tap))*.