Perhaps you should try some spelling variations:
sach doanh » sach danh, sach tranh, cac doanh
hanh trinh » canh tranh, hanh chinh
trinh nghe » trinh nghien, trinh he, trinh nha
nghiep tu » nghiep vu, nghiep vua, nghiep cua
duy hanh » duy khanh, duy nhanh, du hanh
su sach » so sach, vu sach
nghe xa » nghe xay, nghe va, nghe xu
tu hoc » te hoc
xa hoc » xa hoi, va hoc, xa hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach doanh nghiep tu hoc ) or ( duy hanh trinh nghe xa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach doanh nghiep tu hoc ) OR ( duy hanh trinh nghe xa hoc ))*.