Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
va cao » va cac, va dao, va bao
xuc va » duc va, tuc va, luc va
cua te » cua tu
va co » vo co

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 ky nang xa hoi. hieu ((va cao) OR (va co)) xuc va tinh vi ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((va cao) OR (va co)) xuc va tinh vi ((cua te) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((va cao) OR (va co)) xuc va tinh vi ((cua te) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((va cao) OR (va co)) xuc va tinh vi ((cua te) or (cuu tre))*.