Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thieu tach » thien hach, chiet tach, chieu sach
hoc thieu » toc thieu, hoc hien
cua nhung » va nhung
anh hang » anh hoang, anh hung, anh dang
anh bang » anh hoang, anh quang, tinh bang
tac toan » tap toan, hach toan, tich toan
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 tach - ((anh hang) or (anh bang)) cua nhung cong ((tac toan) OR (tam toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tach - ((anh hang) OR (anh bang)) cua nhung cong ((tac toan) OR (tam toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tach - ((anh hang) or (anh bang)) cua nhung cong ((tac toan) OR (tam toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tach - ((anh hang) or (anh bang)) cua nhung cong ((tac toan) OR (tam toan)) cau*.