Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
su sach » vu sach
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ma cua
ca cua » co cua
va cam » va cham, va cac, va cao
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: ((su sach) OR (so sach)) y nang x hoi. hieu va cam tuc va thanh ((va cua) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang x hoi. hieu va cam tuc va thanh ((va cua) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y nang x hoi. hieu va cam tuc va thanh ((va cua) or (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y nang x hoi. hieu va cam tuc va thanh ((va cua) or (ca cua)) tre*.