Perhaps you should try some spelling variations:
chat thom » chat thai, chat hoa, chat cho
toc sach » hoc sach, doc sach, thuoc sach
cuc ban » cua ban, cac ban, cuu ban
xuc ban » duc ban, quoc ban, xuat ban
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cho hoc » co hoc, khoa hoc
cua cau » cua cac, cua chu, cua cay
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 ky nang ((chat thom) or (cho hoc)). hieu va cac ((xuc ban) OR (cuc ban)) hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((chat thom) OR (cho hoc)). hieu va cac ((xuc ban) OR (cuc ban)) hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((chat thom) or (cho hoc)). hieu va cac ((xuc ban) OR (cuc ban)) hanh vi cua cau*".