Perhaps you should try some spelling variations:
trinh xuan » trinh quan, trinh luan, trinh luat
hanh trinh » canh tranh, hanh chinh
xuan trung » xuan truong, quang trung, doan trung
trung cong » truong cong, trong cong, trung uong
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
cong sat » cong suat, cong san, cong hat
sat phan » sat nhan, vat phan, xuat phan
phan lap » phan 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 ((hien sach) or (kien sach)) - hanh trinh xuan trung cong sat phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - hanh trinh xuan trung cong sat phan lap*.