Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
tran trong » gian trong, quan trong, tran hong
trong su » trong san, trong thu, trong qua
cong tap » cuong tap, cong tac, tong tap
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban

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)) - tran trong su dung ((cong tap) OR (cong tan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu tinh) OR (chieu sach)) - tran trong su dung ((cong tap) OR (cong tan)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu tinh) or (chieu sach)) - tran trong su dung ((cong tap) OR (cong tan)) toan tap".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tinh) or (chieu sach)) - tran trong su dung ((cong tap) OR (cong tan)) toan tap*.