Perhaps you should try some spelling variations:
sach tham » sach nha
tham nang » nham nang, tham lang, tham nhung
cua viet » ca viet, hoa viet, cua vat
banh kem » hanh kem, banh keo, ban kem
thuc dan » thuc hanh, hoc dan, thuc vat
hieu van » hieu va, thien van, lieu va
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc day
nang ma » tang ma, sang ma, nang cao
kem cua » em cua, keo cua, diem cua
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, xa hoi, ma hoa

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tham nang ma hoi. hieu van cau ((thuc va) OR (thuc dan)) banh kem cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach tham nang ma hoi. hieu van cau ((thuc va) OR (thuc dan)) banh kem cua viet*.