Perhaps you should try some spelling variations:
sinh sach » chinh sach, sinh san, sang sach
hanh tran » hanh trang, thanh tran, hanh tram
van trong » van truong, vang trong, van trung
ban trong » bai trong, ban tuong, ben trong
cong san » cong tac
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh sach - hanh tran ((van trong) or (ban trong)) cong san ((phan cau) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh sach - hanh tran ((van trong) OR (ban trong)) cong san ((phan cau) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: hoc sinh sach - hanh tran ((van trong) or (ban trong)) cong san ((phan cau) or (phan dau))*.