Perhaps you should try some spelling variations:
khanh thuong » thanh thuong, hang thuong, khanh phong
thuong hoc » truong hoc, tuong hoc, thuong ho
nghien uu » nghien cuu, nghiep tu, hien uu
nghiep vu » nghiep va
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
sach doi » sach hoi, sach moi, sach dao
nhan van » nhan dan, nhan va, phan van
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
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: tu sach doi tap, ((nghien uu) or (nghiep vu)) hoa hoc khanh thuong hoc xa hoi ca nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, ((nghien uu) OR (nghiep vu)) hoa hoc khanh thuong hoc xa hoi ca nhan van.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, ((nghien uu) or (nghiep vu)) hoa hoc khanh thuong hoc xa hoi ca nhan van*.