Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hoc sach » hoc sinh, hoc cac, hoc anh
nang ma » tang ma, sang ma, nang cao
cac dat » cac dan, cai dat, cac dai
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
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: ((thuoc sach) or (hoc sach)) y nang ma hoi. lieu va cac dat ((va hanh) OR (va danh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) y nang ma hoi. lieu va cac dat ((va hanh) OR (va danh)) vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (hoc sach)) y nang ma hoi. lieu va cac dat ((va hanh) OR (va danh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc sach)) y nang ma hoi. lieu va cac dat ((va hanh) OR (va danh)) vi cua vat*.