Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cua viet » ca viet, hoa viet, cua vat
vu cham » va cham, vu kham, tu cham
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, xuc ban
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
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 xa hoi. hieu ((vu cham) or (ve cac)) xuc van ((hanh di) OR (hang di)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. hieu ((vu cham) OR (ve cac)) xuc van ((hanh di) OR (hang di)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. hieu ((vu cham) or (ve cac)) xuc van ((hanh di) OR (hang di)) cua viet".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu ((vu cham) or (ve cac)) xuc van ((hanh di) OR (hang di)) cua viet*.