Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
theo chieu » theo tieu, ho chieu, theo chu
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
cho chu » cho thue
mang va » mang vua, hang va, bang va

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

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