Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
tranh cua » doanh cua, manh cua
dung cong » dung trong
tac chang » tac chong, cac chung, tac vang
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
chang tu » chung tu, chang xu, hang tu

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) or (chieu sach)) - canh tranh cua dung cong tac chang tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu tinh) OR (chieu sach)) - canh tranh cua dung cong tac chang tu.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tinh) or (chieu sach)) - canh tranh cua dung cong tac chang tu*.