Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hoc sach » hoc sinh, hoc cac, hoc anh
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
va dinh » van dinh, va kinh, va tinh
v nang » va nang, vu nang, van nang
luc va » duc va, tuc va, loc va
di cua » doi cua, de cua, do 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: ((thuoc sach) or (hoc sach)) v nang x hoi. hieu va cac luc va dinh ((di cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) v nang x hoi. hieu va cac luc va dinh ((di cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc sach)) v nang x hoi. hieu va cac luc va dinh ((di cua) or (dai cua)) tre*.