Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
thanh cua » tranh cua, hanh cua, thanh cha
dung cong » dung trong
doc hieu » toc thieu, hoc hien
than cua » nhan cua, thai cua, ban cua
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
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: ((doc hieu) OR (hoc thieu)) manh - doanh ((thanh cua) OR (than cua)) dung cong tan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (hoc thieu)) manh - doanh ((thanh cua) OR (than cua)) dung cong tan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) manh - doanh ((thanh cua) OR (than cua)) dung cong tan toan cau*.