Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
cap phoi » cap cho
hanh di » hanh vi, hanh de, hang di
truc va » thuc va, trung va
sach ky » sac ky, sach y, sach ty
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
va cap » va cac, va dap, va cao
ky va » ly va, ke va, my va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky va cap phoi. hieu ((ve cam) OR (va cam)) ((truc va) or (thuc vat)) hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky va cap phoi. hieu ((ve cam) OR (va cam)) ((truc va) OR (thuc vat)) hanh di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky va cap phoi. hieu ((ve cam) OR (va cam)) ((truc va) or (thuc vat)) hanh di cua vat".
• Adding a wildcard symbol may retrieve word variants: doc sach ky va cap phoi. hieu ((ve cam) OR (va cam)) ((truc va) or (thuc vat)) hanh di cua vat*.