Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu ve cac ly ((va hanh) OR (va thanh)) vai ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve cac ly ((va hanh) OR (va thanh)) vai ((cua tre) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ve cac ly ((va hanh) OR (va thanh)) vai ((cua tre) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve cac ly ((va hanh) OR (va thanh)) vai ((cua tre) or (va triet))*.