Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuat lanh » thuat lap, thuat san
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
chuc va » thuc va, thuc vat
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va dao » ca dao
dai va » mai va

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 (thuat lanh)) y nang ma hoa. hieu ((va dau) OR (va dao)) chuc va hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat lanh)) y nang ma hoa. hieu ((va dau) OR (va dao)) chuc va hanh dai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (thuat lanh)) y nang ma hoa. hieu ((va dau) OR (va dao)) chuc va hanh dai va triet".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat lanh)) y nang ma hoa. hieu ((va dau) OR (va dao)) chuc va hanh dai va triet*.