Perhaps you should try some spelling variations:
thuoc ban » thuoc tan, thuoc dang, thu ban
thuc van » thuc vat, thuc dan, thuc va
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
lai cua » dai cua, hai cua, lai chau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky mang may hoi. hieu va tham ((thuc van) or (thuoc ban)) hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky mang may hoi. hieu va tham ((thuc van) OR (thuoc ban)) hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky mang may hoi. hieu va tham ((thuc van) or (thuoc ban)) hanh lai cua viet*.