Perhaps you should try some spelling variations:
hanh cong » thanh cong, hang cong, hanh dong
cong suat » nang suat, cong san, cong cua
suat tong » suat thong, suat trong, suat tang
tong cong » trong cong, cong cong, dung cong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » hoc thieu, hoc hien
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) manh - hanh cong suat tong cong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) manh - hanh cong suat tong cong manh toan ban.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) manh - hanh cong suat tong cong manh toan ban*.