Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
cap phoi » cap cho
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
hanh di » hanh vi, hanh de, hang di
va cap » va cac, va dap, va cao
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua
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 (ve cac)) truc van 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 (ve cac)) truc van hanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: doc sach ky va cap phoi. hieu ((ve cam) or (ve cac)) truc van hanh di cua vat*.