Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va thanh » ban thanh, va tinh, le thanh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
cac ly » cac ky, cac le, cam ly

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: vu sach ky nang xa hoi. hieu ve cac ly ((va thanh) OR (gia thanh)) vai ((cuu tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. hieu ve cac ly ((va thanh) OR (gia thanh)) vai ((cuu tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu ve cac ly ((va thanh) OR (gia thanh)) vai ((cuu tre) or (cua triet))*.