Perhaps you should try some spelling variations:
cac nuoc » hoc nuoc, dat nuoc, cua nuoc
cap nuoc » dat nuoc
than cua » thai cua, ban cua, gian cua
nhan cua » nhat cua, nhan luc, nhan su
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
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 x hoi. hieu va ((cac nuoc) OR (cap 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 x hoi. hieu va ((cac nuoc) OR (cap 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 x hoi. hieu va ((cac nuoc) OR (cap nuoc)) va hanh ((than cua) or (nhan cua)) tre*".