Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
dung dong » dung cong, vung dong, dung trong
dong gian » duong gian, don gian, dong giao
gian than » gian thanh, gian thai, giay thanh
cong tan » cong tac, cong san, cong thanh
tan dung » tran dung, tin dung, van dung
than cap » khan cap, thanh lap, thanh cac
hieu ca » hieu cac, hieu cua, hieu va

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) or (hieu ca)) - thanh cong tan dung dong gian than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sach) OR (hieu ca)) - thanh cong tan dung dong gian than cap*.