Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghe cua
nghiep vua » nghiep va, nghiep vu
phan chung » phan cung, phan hung, phan thuong
chung hoc » trung hoc, dung hoc, hung hoa
doc sach » hoc sach, toc sach, nuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
hoc phan » hoc dan, hoc pho
nhan dan » phan dau, gian dan, nhan tai
mot hoc » mon hoc, mo hoc, mot goc
va nhan » van nhan, ca nhan, va phan
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: doc sach hoc tap, ((nghien cua) or (nghiep vua)) mot hoc phan chung hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach hoc tap, ((nghien cua) OR (nghiep vua)) mot hoc phan chung hoc xa hoi va nhan dan*.