Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
ty hang » ly hang, ty xang, thi hang
van cac » van hac, van cau, van bac
cac dat » cac dan, cai dat, cac dai
va hanh » va thanh, va danh, ban hanh
ty nang » ky nang, ty xang, ly nang
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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 ((ty nang) or (ty hang)) ma hoi. hieu van cac dat ((va hanh) or (van hanh)) di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ty nang) OR (ty hang)) ma hoi. hieu van cac dat ((va hanh) OR (van hanh)) di cua vat.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ty nang) or (ty hang)) ma hoi. hieu van cac dat ((va hanh) or (van hanh)) di cua vat*.