Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh sai » dinh tai, danh sai, dinh hai
va trien » va truyen, va thiet, va tuyen
hieu van » hieu va, thien van, lieu va
ve triet » su triet
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, luc va
cua tu » cua tuc, cua su, cua cu

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

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