Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham xuc » cam xuc, chat xuc, cham soc
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
vai cua » hai cua, lai cua, bai cua
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va

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) OR (doc sach)) y nang xa hoi. hieu van cham xuc va danh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) y nang xa hoi. hieu van cham xuc va danh ((vai cua) OR (dai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y nang xa hoi. hieu van cham xuc va danh ((vai cua) or (dai cua)) tre*".