Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cau phuc » cau truc, chau phu, huu phuc
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
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: hoc sach ky nang ma hoi. hieu ve cau phuc ((va hanh) OR (va thanh)) di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang ma hoi. hieu ve cau phuc ((va hanh) OR (va thanh)) di ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang ma hoi. hieu ve cau phuc ((va hanh) OR (va thanh)) di ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang ma hoi. hieu ve cau phuc ((va hanh) OR (va thanh)) di ((cua tre) or (cuu tre))*.