Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
nhat tan » nhat ban, nhat trang, nhat hanh
cua van » cua ban, cua vat, cua dan
van hoc » van hoa
pha tan » pha tap, pha ban, pha san
hoc xa » hoc ma

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 cua van hoc khanh hoa hoc xa hoi va ((pha tan) or (nhat tan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach hoc tap, nghien cua van hoc khanh hoa hoc xa hoi va ((pha tan) OR (nhat tan)).
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cua van hoc khanh hoa hoc xa hoi va ((pha tan) or (nhat tan))*.