Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
cac ly » cac le, cam ly, cap ly
thiet » thieu

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 ty lang xa hoi. hieu ve ((cac ly) OR (cac ky)) va hanh vi ((cua tre) OR (va thiet))~.
• Adding a wildcard symbol may retrieve word variants: vu sach ty lang xa hoi. hieu ve ((cac ly) or (cac ky)) va hanh vi ((cua tre) or (va thiet))*.