Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
lang thang » cang thang, dang thanh, hung thang
sach nang » cach mang, sach dung, sach danh
dong cong » duong cong, dung cong, dang cong
dang toan » dang tran, dan toan, dung toan
nang dua » nang du, nang suat, nang quan
dua dong » cua dong, duc dong, duy dong

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sach - sach nang dua dong cong ((lang thang) or (dang toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - sach nang dua dong cong ((lang thang) OR (dang toan)) cao*.