Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » sinh cua, tinh chat, tranh cua
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
ho kieu » so kieu, thi kieu, ho chieu
ho lieu » so lieu, co lieu, ho chieu

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: ((ho kieu) OR (ho lieu)) tinh - hanh ((trinh cua) OR (tinh cua)) thuong cong tan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho kieu) OR (ho lieu)) tinh - hanh ((trinh cua) or (tinh cua)) thuong cong tan toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((ho kieu) OR (ho lieu)) tinh - hanh ((trinh cua) or (tinh cua)) thuong cong tan toan cao*.