Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » truong va, trang va, trung ha
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
tung va » tuong va, dung va, vung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu tinh - thanh ((tung va) or (trung va)) dung cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - thanh ((tung va) OR (trung va)) dung cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - thanh ((tung va) or (trung va)) dung cong tac toan tap*.