Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
cua nhung » va nhung
van thanh » ban thanh, van tuan
dan toan » van toan, dan than, manh toan
can van » cac van, can ban, tan van
van cua » vang cua, ban cua, dan cua

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