Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
duc ban » duc van, dua ban, duc man
hanh de » hanh ve, hanh kem
va cao » va cac, va co, va dao
de va » de van, te va, ke 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 ky ((nang xa) or (nang ma)) hoi. lieu va cao ((duc ban) OR (duc tan)) hanh de va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang xa) OR (nang ma)) hoi. lieu va cao ((duc ban) OR (duc tan)) hanh de va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang xa) or (nang ma)) hoi. lieu va cao ((duc ban) OR (duc tan)) hanh de va triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang xa) or (nang ma)) hoi. lieu va cao ((duc ban) OR (duc tan)) hanh de va triet*.