Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang hoa » nang hoat, hang hoa, nang hoc
sach ky » sac ky, sach y, sach ty
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
cua te » cua tu

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 hoa hoi. hieu va cam xuc ((va hanh) or (va danh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang hoa hoi. hieu va cam xuc ((va hanh) OR (va danh)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang hoa hoi. hieu va cam xuc ((va hanh) or (va danh)) vi cua te*.