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
trinh vat » trinh van, trinh luat, sinh vat
hang cong » dang cong, hang nong, bang cong
cong luan » tong luan, cong tuan, dong luan
luan phan » luan van, luan hoan
vat hang » van hang, dat hang, va hang
phan cau » phan dau, phan cac, phan tu

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 vat hang cong luan phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu sang)) - hanh trinh vat hang cong luan phan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chieu sang)) - hanh trinh vat hang cong luan phan cau*.