Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
nhung cong » dung cong, hang cong, nhung don
hoc dieu » hoc thieu, hoc hien
canh ban » can ban, canh dan, canh van
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca, van chat
ban cua » ban quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc dieu hanh - canh ban cua ((nhung cong) OR (thong cong)) ((dan toan) or (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu hanh - canh ban cua ((nhung cong) OR (thong cong)) ((dan toan) OR (dan chan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc dieu hanh - canh ban cua ((nhung cong) OR (thong cong)) ((dan toan) or (dan chan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc dieu hanh - canh ban cua ((nhung cong) OR (thong cong)) ((dan toan) or (dan chan)) cau*.