Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban hanh » ban hang
cuc ban » cua ban, cac ban, cuu ban
cuu tre » cua tre, cau tren, cau treo
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
ma hoi » xa hoi, ma hoa, me hoi
vi cuu » vi luu, vinh cuu
ve cau » ke cau, va cau, le cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang ((ma hoi) or (mai hoi)). hieu ((ve cau) or (ve cac)) cuc ban hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ((ma hoi) OR (mai hoi)). hieu ((ve cau) OR (ve cac)) cuc ban hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ((ma hoi) or (mai hoi)). hieu ((ve cau) or (ve cac)) cuc ban hanh vi cuu tre*.