Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tang luan » dung luan
toc hieu » toc thieu, doc hieu, hoc thieu
tang cua » mang cua, hang cua, thong cua
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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

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