Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau phuc » cau truc, chau phu, huu phuc
cua tre » cua te, cua triet, dua tren
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
sach ky » sac ky, sach y, sach ty
phuc va » phuc vu, thuc va, chuc va
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
cuu tre » cau tren, cau treo
ve cau » ke cau, va cau, ve cac
ma hoi » mai hoi, xa hoi, ma hoa

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