Perhaps you should try some spelling variations:
chieu hanh » chieu xanh, hien hanh, chi hanh
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
tang cua » hang cua, tang luan, thong cua
mang cua » manh cua, dung cua, ban 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: theo ((chieu hanh) OR (dieu hanh)) - anh ((tang cua) OR (mang cua)) dung cong vang toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu hanh) OR (dieu hanh)) - anh ((tang cua) or (mang cua)) dung cong vang toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu hanh) OR (dieu hanh)) - anh ((tang cua) or (mang cua)) dung cong vang toan cau*.