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