Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
danh vi » dinh vi, danh di, danh va
ca tren » cau tren, cu tren, la tren
cau luc » cau phuc
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
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 sang ma hoi. hieu van ((cau luc) or (cau truc)) va ((danh vi) or (hanh vi)) ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky sang ma hoi. hieu van ((cau luc) OR (cau truc)) va ((danh vi) OR (hanh vi)) ca tren.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky sang ma hoi. hieu van ((cau luc) or (cau truc)) va ((danh vi) or (hanh vi)) ca tren*.