Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh manh » hanh mang, lanh manh, hoang manh
cua nhung » va nhung
manh cua » doanh cua, ban cua
tan van » tran van, tang van, luan van
dao van » do van, dang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - hanh manh cua nhung cong ((tan van) or (dao van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh manh cua nhung cong ((tan van) OR (dao van)) ban.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh manh cua nhung cong ((tan van) or (dao van)) ban*.