Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
nhung cong » thong cong, hang cong, nhung don
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dung cong » dung trong
ho thiet » hoa thiet, so thiet, hoc thieu
mang cua » manh cua, dung cua, ban cua
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 (hoc thiet)) tach - nhanh mang cua ((nhung cong) or (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thiet) OR (hoc thiet)) tach - nhanh mang cua ((nhung cong) OR (dung cong)) dan toan cao.
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) or (hoc thiet)) tach - nhanh mang cua ((nhung cong) or (dung cong)) dan toan cao*.