Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh trinh » canh tranh, hanh chinh
nang cong » nang song, dang cong, bang cong
quang cao » nang cao, quang nam, quang cua
trinh va » trinh van, trinh vat, trinh ve
cong van » cong vang, cong san, song van
tuan cao » toan cao, juan cao, thuan cam
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) OR (chieu sang)) - hanh trinh va nang cong van ((tuan cao) or (quang cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu sang)) - hanh trinh va nang cong van ((tuan cao) OR (quang cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu sang)) - hanh trinh va nang cong van ((tuan cao) or (quang cao))".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chieu sang)) - hanh trinh va nang cong van ((tuan cao) or (quang cao))*.