Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
tu sach » thu sach, su sach, te sach
dai cuu » dai cua, dai huu
truc va » thuc va, thuc vat, trung va
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
tuc va » thuc va, tuc xa, duc va
s_ hai » su hai, so hai
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((_ hai) OR (s_ hai)). hieu va cam ((tuc va) OR (truc va)) vanh dai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((_ hai) or (s_ hai)). hieu va cam ((tuc va) OR (truc va)) vanh dai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((_ hai) or (s_ hai)). hieu va cam ((tuc va) OR (truc va)) vanh dai cuu tre*.