Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh cua » trinh luat, trinh quan, trinh luan
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
hoc hieu » hoc thieu, hoc hien, hoc dieu
doc hieu » toc thieu, hoc thieu, hoc hien
tinh cua » sinh cua, tinh chat, tranh cua
toan cau » toan cao, toan ban, toan tap

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 hieu) OR (doc hieu)) lang - hanh ((trinh cua) OR (tinh cua)) nhung cong hach toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) or (doc hieu)) lang - hanh ((trinh cua) OR (tinh cua)) nhung cong hach toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (doc hieu)) lang - hanh ((trinh cua) OR (tinh cua)) nhung cong hach toan cau*.