Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh vai » danh sai, danh va, doanh van
va triet » va thiet, va trien, ve triet
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
xa danh » va danh, dia danh, nam danh
nang xa » nang x, lang xa, nang ma
vien da » vien dai, hien dai
ve cac » va cac, vien cac
toc xa » tuc xa, toc ta, hoc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu ((ve cac) or (vien da)) toc xa danh vai ((va triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu ((ve cac) OR (vien da)) toc xa danh vai ((va triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu ((ve cac) or (vien da)) toc xa danh vai ((va triet) or (cua viet))*.