Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
nang cong » nang song, dang cong, bang cong
cong van » cong vang, cong san, song van
tuan cao » toan cao, quang cao, thuan cam
juan cao » quang cao, toan cao, quan cau
va nang » van nang, da nang, cam nang

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 sach - ((hanh trinh) or (canh tranh)) va nang cong van ((tuan cao) OR (juan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh trinh) OR (canh tranh)) va nang cong van ((tuan cao) OR (juan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((hanh trinh) or (canh tranh)) va nang cong van ((tuan cao) OR (juan cao))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((hanh trinh) or (canh tranh)) va nang cong van ((tuan cao) OR (juan cao))*.