Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, dao hanh
va danh » va dinh, va dan, dia danh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
va cua » va chua, via cua, ca cua
cua te » cua tu

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 ty nang xa hoi. hieu ve cac duc ((va danh) or (((va hanh) OR (ban hanh)))) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ve cac duc ((va danh) OR (((va hanh) OR (ban hanh)))) va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ve cac duc ((va danh) or (((va hanh) OR (ban hanh)))) va cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve cac duc ((va danh) or (((va hanh) OR (ban hanh)))) va cua te*.