Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, hieu ca
bieu cua » dieu cua, ben cua, dien cua
nhan xua » nhan cua, ngan xua, nhan xu
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
xua va » xuat va, vua va, sua va
va dau » va dao
dau vi » dau ve, dau va, dat vi
vi cuu » vi luu, vinh cuu
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: so sach ky nang x hoi. ((hieu cua) OR (bieu cua)) nhan xua va dau vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang x hoi. ((hieu cua) OR (bieu cua)) nhan xua va dau vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x hoi. ((hieu cua) OR (bieu cua)) nhan xua va dau vi cuu tre*.