Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
khoa hoi » khoan hoi, khoa hoc, khoa doi
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
ty hang » ly hang, thi hang, thu hang
vi cuu » vi luu, vinh cuu
va cam » va cham, va cac, va cao

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 xang) or (ty hang)) khoa hoi. hieu va cam xuc ((van hanh) or (va danh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty xang) OR (ty hang)) khoa hoi. hieu va cam xuc ((van hanh) OR (va danh)) vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty xang) or (ty hang)) khoa hoi. hieu va cam xuc ((van hanh) or (va danh)) vi cuu tre*.