Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van nang » van quang, van ban, van dong
hieu va » lieu va, hieu qua
xuc gia » duc gia, luc gia, tuc gia
v nang » va nang, vu nang, voi nang
va cam » va cham, va cac, va cao
di cua » doi cua, de cua, do cua

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 ((v nang) OR (van nang)) xa hoi. hieu va cam xuc gia thanh ((di cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (van nang)) xa hoi. hieu va cam xuc gia thanh ((di cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((v nang) OR (van nang)) xa hoi. hieu va cam xuc gia thanh ((di cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) OR (van nang)) xa hoi. hieu va cam xuc gia thanh ((di cua) or (dai cua)) tre*.