Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
hang hang » cang thang, hung thang, lang thang
nang hang » nang sang, cang thang, lang thang
cua nhung » va nhung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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: toc ((thieu sach) or (thien hach)) - ((hang hang) OR (nang hang)) cua nhung cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sach) OR (thien hach)) - ((hang hang) OR (nang hang)) cua nhung cong tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sach) or (thien hach)) - ((hang hang) OR (nang hang)) cua nhung cong tac toan tap".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) or (thien hach)) - ((hang hang) OR (nang hang)) cua nhung cong tac toan tap*.