Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, ho chieu, mot chieu
cua nhung » va nhung
cong tac » cong ty
tac nhan » tao nhan, cac nhan, dac nhan
nhan cau » nhanh cau, phan cau, nhan sau
doi chi » doi khi

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) or (doi chi)) sach - ((hanh trinh) or (canh tranh)) cua nhung cong tac nhan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - ((hanh trinh) OR (canh tranh)) cua nhung cong tac nhan cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sach - ((hanh trinh) or (canh tranh)) cua nhung cong tac nhan cau*.