Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nang ma » tang ma, sang ma, nang cao
van cau » van hau, van chat, toan cau
van dau » van dao, phan dau
phuc va » phuc vu, thuc va, chuc va
han tai » hang tai, nhan tai, van tai
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
va han » va phan, van han, va hanh

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 ma hoi. hieu ((van cau) OR (van dau)) phuc va han tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ma hoi. hieu ((van cau) OR (van dau)) phuc va han tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang ma hoi. hieu ((van cau) OR (van dau)) phuc va han tai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ma hoi. hieu ((van cau) OR (van dau)) phuc va han tai ((cua tre) or (cuu tre))*.