Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
tinh bai » tinh bac, tinh hai, hinh bai
tinh vai » tinh va, tinh hai, tinh lai
vu sach » vu bach, su sach, vu khach
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
hieu va » hieu qua
hang ma » hang va, hang ca, tang ma
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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: vu sach ty hang ma hoi. ((hieu va) OR (lieu va)) nham thuc va ((tinh vai) OR (tinh bai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty hang ma hoi. ((hieu va) or (lieu va)) nham thuc va ((tinh vai) OR (tinh bai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach ty hang ma hoi. ((hieu va) or (lieu va)) nham thuc va ((tinh vai) OR (tinh bai)) cua tre*.