Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu sach » chinh sach, chiet tach, chieu sang
trinh quan » tinh quang, trinh luat, trinh han
quan trung » quang trung, quan trong, xuan trung
trung cong » truong cong, trong cong, trung uong
kien sach » dien sach, vien bach, kien mac
cong hat » cong nhat, cong chat, cong ha
hat phan » hat nhan, sat phan, vat 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 ((chieu sach) or (kien sach)) - hanh trinh quan trung cong hat phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (kien sach)) - hanh trinh quan trung cong hat phan lap*.