Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, toc thieu
cua nhung » va nhung
cong tinh » cong trinh, cong vinh, long tinh
so thiet » soc thiet, hoa thiet, tao thiet
toan cau » toan cao, toan ban, toan tap
anh ban » anh bang, anh bai, anh van
ban cua » ban quan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((hoc thiet) OR (hoc hien))) OR (so thiet)) tach - anh ban cua nhung cong tinh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((hoc thiet) OR (hoc hien))) or (so thiet)) tach - anh ban cua nhung cong tinh toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((((hoc thiet) OR (hoc hien))) or (so thiet)) tach - anh ban cua nhung cong tinh toan cau*.