Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » hanh chinh
doi chiet » doi chieu, doi chi, doi viet
nang cong » nang song, dang cong, bang cong
van tuan » van ban, anh tuan
van quan » van ban
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 chiet tach - ((hanh trinh) or (canh tranh)) va nang cong ((van tuan) OR (van quan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - ((hanh trinh) OR (canh tranh)) va nang cong ((van tuan) OR (van quan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chiet tach - ((hanh trinh) or (canh tranh)) va nang cong ((van tuan) OR (van quan)) cao".
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - ((hanh trinh) or (canh tranh)) va nang cong ((van tuan) OR (van quan)) cao*.