Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
trong tinh » truong tinh, trong kinh, trong sinh
doi chieu » doc hieu, doi chi, ho chieu
trong van » trong cac
tang vat » tang van, bang vat, cang vat
dang vat » dang van, dong vat, dang nhat
toan ban » van ban

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 - canh ((((tang vat) OR (dang vat))) OR (trong van)) dung trong tinh toan ban~.
• Adding a wildcard symbol may retrieve word variants: doi chieu tinh - canh ((((tang vat) or (dang vat))) or (trong van)) dung trong tinh toan ban*.