Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
xuc van » duc van, luc van, vuc van
ty nang » ky nang, ty xang, ty hang
hanh di » hanh vi, hanh de, hang di
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua

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 ty nang ma hoi. hieu ((va cham) or (ve cac)) xuc van hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nang ma hoi. hieu ((va cham) OR (ve cac)) xuc van hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang ma hoi. hieu ((va cham) or (ve cac)) xuc van hanh di cua viet*.