Perhaps you should try some spelling variations:
ngay thuong » ngoai thuong, ngu thuong, nghi thuong
thuong chi » thuong mai
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cuu long » cuu cong, cuu tong, cuu nang
long moi » luong moi, trong moi, dung moi
moi ngay » moi nganh, moi nhat
nhan dan » phan dau, nhan tai
gian dan » gian lang
chi xa » thi xa, chi a, chi ha

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach hoc tap, nghien cuu long moi ngay thuong chi xa hoi va ((nhan dan) or (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoc tap, nghien cuu long moi ngay thuong chi xa hoi va ((nhan dan) OR (gian dan)).
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu long moi ngay thuong chi xa hoi va ((nhan dan) or (gian dan))*.