Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, kieu tinh
hanh manh » hanh mang, lanh manh, hoang manh
dung cong » dung trong
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh
van quan » van ban
co hieu » cao hieu, doc hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co hieu tinh - hanh manh cua dung cong ((dan than) or (((van toan) or (van quan)))) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co hieu tinh - hanh manh cua dung cong ((dan than) OR (((van toan) OR (van quan)))) cao.
• Adding a wildcard symbol may retrieve word variants: co hieu tinh - hanh manh cua dung cong ((dan than) or (((van toan) or (van quan)))) cao*.