Perhaps you should try some spelling variations:
nhan cua » nhat cua, nhan luc, nhan su
than cua » thai cua, ban cua, gian cua
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
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: tu sach ((ly nang) OR (ly vang)) x hoi. hieu va cac nuoc va hanh ((than cua) or (nhan cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ly vang)) x hoi. hieu va cac nuoc va hanh ((than cua) OR (nhan cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) OR (ly vang)) x hoi. hieu va cac nuoc va hanh ((than cua) or (nhan cua)) tre*".