Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
tong cong » trong cong, cong cong, dung cong
cong cua » cong cu, huong cua, thong cua
dong cua » dung cua, huong cua, thong cua
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 ((cong cua) or (dong cua)) tong cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh ((cong cua) OR (dong cua)) tong cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh ((cong cua) or (dong cua)) tong cong dan than cau*.