Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
su triet » su viet, ve triet
van cham » van chat, van tham, van pham
va cham » va chat, va tham
su tien » su kien, su hien, tu tieng
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
v nang » va nang, vu nang, van nang

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: toc sach v nang xa hoi. thien ((van cham) OR (va cham)) xuc va dan vi ((su triet) OR (su tien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang xa hoi. thien ((van cham) OR (va cham)) xuc va dan vi ((su triet) or (su tien))~".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang xa hoi. thien ((van cham) OR (va cham)) xuc va dan vi ((su triet) or (su tien))*.