Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
doanh hoan » doanh doanh, doanh khoa, doanh nhan
nhung cong » thong cong, hang cong, nhung don
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
toan phan » thanh phan, toan ban, hoa phan
hoan cua » hoa cua, toan cua, han cua
phan dau » phan tu, hang dau

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 - doanh hoan cua ((nhung cong) OR (dung cong)) toan phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - doanh hoan cua ((nhung cong) OR (dung cong)) toan phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - doanh hoan cua ((nhung cong) OR (dung cong)) toan phan dau*.