Perhaps you should try some spelling variations:
nghien chu » nghien cuu, nghiep cau, nghiep che
chu trong » chu trang, cay trong, tu trong
sach hoc » cach hoc, sach hoi, mach hoc
hoc hanh » hoc nhanh, hoc thanh, hoc anh
nhan van » nhan dan, nhan va, phan van
so sach » so sanh, bo sach, co sach
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoc tap, nghien chu trong ((hoc hanh) or (hoc dan)) hoa hoc xa hoi ca nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoc tap, nghien chu trong ((hoc hanh) OR (hoc dan)) hoa hoc xa hoi ca nhan van.
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien chu trong ((hoc hanh) or (hoc dan)) hoa hoc xa hoi ca nhan van*.