Perhaps you should try some spelling variations:
dang cong » dung cong
theo yeu » theo tieu, thiet yeu, theo chu
chao chu » cho chu, cua chu, cao cho
anh dung » anh dong, anh huong, sach dung
tap toan » tap quan, bai toan
tap doan » tap quan
va dang » van dang, va nang, va lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo yeu) or (chao chu)) sang - anh dung va dang cong ((tap toan) OR (tap doan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo yeu) OR (chao chu)) sang - anh dung va dang cong ((tap toan) OR (tap doan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo yeu) or (chao chu)) sang - anh dung va dang cong ((tap toan) OR (tap doan)) cao".
• Adding a wildcard symbol may retrieve word variants: ((theo yeu) or (chao chu)) sang - anh dung va dang cong ((tap toan) OR (tap doan)) cao*.