Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
trinh vat » trinh luat, sinh vat, trinh han
trinh van » trinh han, trinh quan, trinh toan
cong tac » cong ty
tac chan » tac chuan, tac can, tac chon
chan tu » phan tu, han tu, chon tu

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) or (chieu sach)) - canh ((trinh vat) OR (trinh van)) nhung cong tac chan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu tinh) OR (chieu sach)) - canh ((trinh vat) OR (trinh van)) nhung cong tac chan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu tinh) or (chieu sach)) - canh ((trinh vat) OR (trinh van)) nhung cong tac chan tu".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu tinh) or (chieu sach)) - canh ((trinh vat) OR (trinh van)) nhung cong tac chan tu*.