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