Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
vinh cua » sinh cua, tinh cua, vinh cuu
dinh cua » dinh cuu, sinh cua, dinh cu
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
vu cham » va cham, vu kham, tu cham
va danh » va dinh, va dan, va hanh
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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 ((ve cac) or (vu cham)) luc va danh ((vinh cua) OR (dinh cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. hieu ((ve cac) OR (vu cham)) luc va danh ((vinh cua) OR (dinh cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. hieu ((ve cac) or (vu cham)) luc va danh ((vinh cua) OR (dinh cua)) tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu ((ve cac) or (vu cham)) luc va danh ((vinh cua) OR (dinh cua)) tre*.