Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trung tuan » trung thanh, trung tam, tran tuan
hoc thieu » toc thieu, hoc hien
duong bai » cuong bai, duong tai, dung bai
dung cua » dung luan, dung cho
bai toan » bai tap
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 thieu sach - thanh ((dung cua) or (trung tuan)) tuong duong bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh ((dung cua) OR (trung tuan)) tuong duong bai toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh ((dung cua) or (trung tuan)) tuong duong bai toan tap*.