Perhaps you should try some spelling variations:
dung thang » hung thang, cung thang, dung thuong
tien cong » thien cong, trien cong, tien luong
cong luan » tong luan, cong tuan, dong luan
hieu suat » hieu luat, hieu qua
thang van » tang van, thanh van, thong van
van chien » van hien, van tien
van hieu » cao hieu
chien ha » chien va, thien ha, chien dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tien cong luan van hieu suat ) or ( tin dung thang van chien ha ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tien cong luan van hieu suat ) OR ( tin dung thang van chien ha ))*.