Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang noi » nang doc
ban hanh » ban hang
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
noi hoc » hoi hoc, voi hoc, noi khoa
cua cay » cua cac
ve cac » vien cac
tu ban » thu ban, te ban
vi cua » vai cua, di cua

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 ty nang noi hoc. hieu ((ve cac) or (va cac)) tu ban hanh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang noi hoc. hieu ((ve cac) OR (va cac)) tu ban hanh vi cua cay*.