Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
trinh vat » trinh van, trinh luat, sinh vat
nang cong » nang song, dang cong, bang cong
vat nang » van nang, va nang, vat mang
dan luan » doanh luan, dung luan, tang luan

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 tinh - hanh trinh vat nang cong ((quan luan) or (dan luan)) thu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu tinh - hanh trinh vat nang cong ((quan luan) OR (dan luan)) thu*.