Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cua viet » ca viet, hoa viet, cua vat
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, xuc ban
nang ma » tang ma, sang ma, nang cao
hanh di » hanh de, hang di, danh di
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac

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 cham) or (ve cac)) xuc van ((hanh di) OR (hanh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang ma hoi. hieu ((ve cham) OR (ve cac)) xuc van ((hanh di) OR (hanh vi)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang ma hoi. hieu ((ve cham) or (ve cac)) xuc van ((hanh di) OR (hanh vi)) cua viet".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang ma hoi. hieu ((ve cham) or (ve cac)) xuc van ((hanh di) OR (hanh vi)) cua viet*.