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
hanh manh » hanh mang, lanh manh, hoang manh
cua nhung » va nhung
hach toan » thanh toan, manh toan
manh cua » doanh cua, ban cua
tac toan » tap toan, tich toan, tac thanh
tam toan » tap toan, tam than, pham toan

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 - hanh manh cua nhung cong ((((tac toan) OR (tam toan))) or (hach toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh manh cua nhung cong ((((tac toan) OR (tam toan))) OR (hach toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh manh cua nhung cong ((((tac toan) OR (tam toan))) or (hach toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh manh cua nhung cong ((((tac toan) OR (tam toan))) or (hach toan)) cau*.