Perhaps you should try some spelling variations:
manh tuong » manh tung, manh cuong, minh tuong
thieu lang » thieu khang, thieu quang, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
tuong va » truong va, thuong va, luong va
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 lang) OR (hieu lang)) - manh tuong va nhung cong ((tac toan) or (tam toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu lang) OR (hieu lang)) - manh tuong va nhung cong ((tac toan) OR (tam toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu lang) OR (hieu lang)) - manh tuong va nhung cong ((tac toan) or (tam toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu lang) OR (hieu lang)) - manh tuong va nhung cong ((tac toan) or (tam toan)) cao*.