Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cuoc van » cuoi van, luoc van, quoc van
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
cho hoc » khoa hoc
hieu va » lieu va, hieu qua
ca cuoc » va cuoc, cho cuoc, dao cuoc
cua cay » cua cac
vi cua » vai cua, di cua
va ca » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang ((cho hoc) or (co hoc)). hieu va ca cuoc van hanh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((cho hoc) OR (co hoc)). hieu va ca cuoc van hanh vi cua cay*.