Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
cham luc » cham soc, nhan luc, cham cuu
va cham » va chat, va tham
v nang » va nang, vu nang, van nang
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

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 (hoc sach)) v nang x hoi. lieu va cham luc va dan ((dai cua) or (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) v nang x hoi. lieu va cham luc va dan ((dai cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) v nang x hoi. lieu va cham luc va dan ((dai cua) or (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) v nang x hoi. lieu va cham luc va dan ((dai cua) or (de cua)) tre*.