Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
cac ly » cac le, cam ly, cap 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: su sach ty lang xa hoi. hieu ve ((cac ly) OR (cac ky)) va hanh vi ((cua tre) OR (va thieu))~.
• Adding a wildcard symbol may retrieve word variants: su sach ty lang xa hoi. hieu ve ((cac ly) or (cac ky)) va hanh vi ((cua tre) or (va thieu))*.