Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
doi chieu » doc hieu, doi chi, ho chieu
hanh sinh » hanh tinh, hanh dinh, hinh sinh
cong tac » cong ty
toan ban » van ban
sinh va » sinh vat, tinh va, dinh van
va cong » tai cong, cua cong

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: doi chieu tinh - hanh sinh va cong ((cong san) OR (cong tac)) ((toan ban) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu tinh - hanh sinh va cong ((cong san) OR (cong tac)) ((toan ban) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu tinh - hanh sinh va cong ((cong san) OR (cong tac)) ((toan ban) or (toan tap))*.