Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
doi chieu » doc hieu, doi chi, ho chieu
trung vat » trung van, trong vat, truong van
dung cong » dung trong
thoai cac » tai cac, thong cac, tho cac
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong thanh
thai cao » tai cao, thuat cao, toan cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu tinh - thanh ((trung vat) or (trung va)) dung cong tan ((thai cao) or (thoai cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu tinh - thanh ((trung vat) OR (trung va)) dung cong tan ((thai cao) OR (thoai cac)).
• Adding a wildcard symbol may retrieve word variants: doi chieu tinh - thanh ((trung vat) or (trung va)) dung cong tan ((thai cao) or (thoai cac))*.