Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
vu kham » vu khanh
vai cua » dai cua, hai cua, lai cua
cac ban » cac dan, cac van, can ban
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
vi cua » di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang xa hoi. hieu ((ve cham) or (vu kham)) cac ban hanh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu ((ve cham) OR (vu kham)) cac ban hanh ((vi cua) OR (vai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. hieu ((ve cham) or (vu kham)) cac ban hanh ((vi cua) OR (vai cua)) tre*".