Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
cac ly » cac le, cam ly, cap ly

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky lang xa hoi. hieu ve ((cac ly) or (cac ky)) va hanh vi ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu ve ((cac ly) OR (cac ky)) va hanh vi ((cua tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu ve ((cac ly) or (cac ky)) va hanh vi ((cua tre) or (va triet))*.