Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
mang maym » mang mam, bang may, dang mam
trinh tai » trinh toan, trinh tu, trinh han
va trinh » van trinh, va tinh, lap trinh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
cuc tre » duc tre, cua tre, cuu tre
va cam » va cham, va cac, va cao

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 ((mang may) or (mang maym)) hoi. hieu va cam duc va trinh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((mang may) OR (mang maym)) hoi. hieu va cam duc va trinh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((mang may) or (mang maym)) hoi. hieu va cam duc va trinh tai cuc tre*.