Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
dung cong » dung trong
cua tinh » cua sinh, va tinh, ha tinh
trang va » tran van, hang va
cong san » cong tac
toan cao » toan ban
toan tap » toan ban
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((cua tinh) or (chieu sach)) - hanh trang va dung cong san ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((cua tinh) OR (chieu sach)) - hanh trang va dung cong san ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((cua tinh) or (chieu sach)) - hanh trang va dung cong san ((toan cao) or (toan tap))*.