Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh van » trinh han, trinh quan, trinh toan
dang cong » dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
van dang » van dong, van dung, van nang
cong dan » cong san, cong tan, huong dan
than cau » phan cau, than cap, thanh chau
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: ho chieu tinh - canh trinh van dang cong dan ((((than cau) OR (toan cau))) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu tinh - canh trinh van dang cong dan ((((than cau) OR (toan cau))) or (phan tu))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - canh trinh van dang cong dan ((((than cau) OR (toan cau))) or (phan tu))*.