Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh tap » tinh tai, tinh tay, tinh toan
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cac » van hac, dan cac, van ca
van cau » van dau, van hau, van chat
van bac » van ban, van bao, van hac
va tinh » may tinh
tap cua » tap quan, tiep cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thi ((((van cac) OR (van cau))) OR (van bac)) duc va tinh tap cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. thi ((((van cac) OR (van cau))) or (van bac)) duc va tinh tap cua viet~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thi ((((van cac) OR (van cau))) or (van bac)) duc va tinh tap cua viet*.