Perhaps you should try some spelling variations:
canh manh » lanh manh, canh tranh, cach mang
dung cong » dung trong
ho thiet » hoc thiet, hoa thiet, hoc thieu
so thiet » soc thiet, hoc thiet, hoa thiet
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung
cong anh » cong danh, dong anh, hong anh
tuan tap » toan tap, tuyen tap, toan tai
tuan tai » toan tai, quan tai, tan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho thiet) OR (so thiet)) tach - canh manh cua dung cong anh ((tuan tap) or (tuan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thiet) OR (so thiet)) tach - canh manh cua dung cong anh ((tuan tap) OR (tuan tai))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) OR (so thiet)) tach - canh manh cua dung cong anh ((tuan tap) or (tuan tai))*".